---
product_id: 1490712
title: "Rain-X RX11806D Washer Fluid Additive-16.9 fl. oz, 500. ml"
brand: "rain-x"
price: "€ 61.54"
currency: EUR
in_stock: true
reviews_count: 13
category: "Rain X"
url: https://www.desertcart.es/products/1490712-rain-x-rx11806d-washer-fluid-additive-16-9-fl-oz
store_origin: ES
region: Spain
---

# Water-beading tech for superior rain repellent Enhances cleaning & streak-free clarity Prevents sleet, snow & ice buildup Rain-X RX11806D Washer Fluid Additive-16.9 fl. oz, 500. ml

**Brand:** rain-x
**Price:** € 61.54
**Availability:** ✅ In Stock

## Summary

> 💦 Drive Clear, Drive Confident: See and Be Seen with Rain-X

## Quick Answers

- **What is this?** Rain-X RX11806D Washer Fluid Additive-16.9 fl. oz, 500. ml by rain-x
- **How much does it cost?** € 61.54 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/1490712-rain-x-rx11806d-washer-fluid-additive-16-9-fl-oz)

## Best For

- rain-x enthusiasts

## Why This Product

- Trusted rain-x brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **All-Weather Warrior:** Fights off sleet, snow, ice, bugs, and road spray for uninterrupted visibility.
- • **Effortless Integration:** Simply add to your existing washer fluid—no complicated swaps or expensive premixes needed.
- • **Next-Level Water Beading:** Advanced Rain-X tech repels water instantly, keeping your view sharp in any downpour.
- • **Cost-Effective Clarity Boost:** Small doses treat gallons, delivering premium performance without premium prices.
- • **Crystal-Clear Vision, Always:** Transforms your windshield into a spotless, streak-free window to the world.

## Overview

Rain-X RX11806D Washer Fluid Additive is a 16.9 fl. oz. concentrate designed to enhance your existing windshield washer fluid with advanced water-beading technology. It improves visibility by preventing and removing sleet, snow, ice, bugs, and road spray, delivering streak-free clarity and superior cleaning performance. Compatible with all vehicles, including Tesla Model Y, it offers a cost-effective, easy-to-use upgrade trusted by over 9,000 users with a 4.6-star rating.

## Description

Simply add Rain‑X Washer Fluid Additive to water or any windshield washer fluid to apply Rain‑X technology.

Review: Works brilliantly paired with SONAX Clear View - Used together (Rain-X + SONAX Clear View 1:100), my 2023 Model Y’s windshield went from dusty/filmy to crystal clear after one wipe—exactly what the pics show (before / mix / after). Beads water nicely, cuts road film, and played fine with the OEM wipers. Pros Instant clarity; no smearing Strong water beading for rain driving Cost-effective: small amounts treat a lot of fluid Tesla Y compatible (no chatter from my blades) Cons Add too much and you can get light residue—measure your mix My mix (works great): SONAX Clear View: 1:100 (≈25 ml per 2.5 L / ~0.85 fl oz per 2.6 qt) Rain-X Additive: ~4–4.5 fl oz per gallon of water (the 16.9 oz bottle treats ~4 gal) Tips Start conservatively on Rain-X; you can add more if needed. Top up with distilled water when possible. If switching from another fluid, run a few sprays to purge the old mix. Bottom line: this combo is an easy, inexpensive one-wipe to crystal-clear upgrade.
Review: Reliable Additive for Better Beading and Clarity - This Rain‑X washer fluid additive works very well in Arizona conditions and integrates smoothly into my RO‑water windshield washer mix. Adding a small amount to each gallon noticeably improves beading and visibility, especially during dust‑and‑drizzle days. It also helps reduce streaking when combined with concentrated washer tablets and a little isopropyl alcohol. The bottle is easy to measure from, the additive mixes cleanly, and the performance difference is immediate once it’s on the glass. It doesn’t replace a full winter formula, but for hot, dry climates it’s a reliable upgrade that makes basic washer fluid perform much better. Overall, it’s a cost‑effective way to improve clarity and wiper performance without switching to expensive premixed fluids.

## Features

- Add to existing washer fluid
- Applies water beading technology
- Enhances driving visibility
- Helps prevent and remove sleet, snow, ice, bugs and road spray from sticking to glass
- Improves cleaning

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000BPTVTK |
| Best Sellers Rank | #1,258 in Automotive ( See Top 100 in Automotive ) #11 in Windshield Washer Fluids |
| Brand | Rain-X |
| Customer Reviews | 4.6 4.6 out of 5 stars (9,050) |
| Date First Available | June 15, 2006 |
| Exterior | Machined |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.3 ounces |
| Item model number | RX11806D |
| Manufacturer | Rain-X |
| Manufacturer Part Number | RX11806D |
| Model | RX11806D |
| Product Dimensions | 7.09 x 7.01 x 9.49 inches |
| Special Features | Streak Free |

## Product Details

- **Brand:** Rain-X
- **Item Form:** Spray
- **Material Feature:** Unscented
- **Scent:** Unscented
- **Specific Uses For Product:** Windshield

## Images

![Rain-X RX11806D Washer Fluid Additive-16.9 fl. oz, 500. ml - Image 1](https://m.media-amazon.com/images/I/51cNcELxXJL.jpg)

## Questions & Answers

**Q: I love the how well the standalone gallon rain-x jugs work.will adding this to non-rain-x fluid make it work just as well as standalone? or not quite?**
A: be cautious i had a washer fluid i added this to and 24 hours later the near as i could tell the rainx reacted with the blue dye in the washer fluid and i had clear washer fluid with a layer of blue sticky slime floating on top of it  i have only had it happen once but might mix this in a jug with you preferred brand of washer fluid and let it set for a day before you add it to your vehicle reservoir to make sure it wont react the same way

**Q: Does this product work well with de-icer washer fluid? Or should I stick to the original glass treatment?**
A: It will work with anything, if you want deicing, you must use it with a deicing washer fluid as a base, or just put 1/2 a bottle of rubbing alcohol in a gallon of water then add 4 oz RainX... the RainX on it's own does a great job as a cleaning fluid, but will freeze without some kind of additive

**Q: Everywhere I look it says don’t add just water to the tank can you or can you not just mix with water?**
A: Yes, you can mix it with plain water - it says so right in the description. I suggest using distilled water though, because the minerals in tap water might eventually block up your lines.

**Q: Does this leave hard-to-remove stains on car? Clog windshield washer nozzles? Leave a hard-to-remove dirty film in windshield corners?**
A: Yes!  Has left bad film and water spots similar to hard water spots on the parts of the glass the wipers don't reach. Washed my windshield at the gas station and it did not come off.  I am pissed.   Probably going to return product and contact rain x for how to clean my windshield.  Also leaves a hard water like stain in a line where right side wiper stops in middle of windshield.   I do not recommend this product .

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works brilliantly paired with SONAX Clear View
*by Z***S on December 13, 2025*

Used together (Rain-X + SONAX Clear View 1:100), my 2023 Model Y’s windshield went from dusty/filmy to crystal clear after one wipe—exactly what the pics show (before / mix / after). Beads water nicely, cuts road film, and played fine with the OEM wipers. Pros Instant clarity; no smearing Strong water beading for rain driving Cost-effective: small amounts treat a lot of fluid Tesla Y compatible (no chatter from my blades) Cons Add too much and you can get light residue—measure your mix My mix (works great): SONAX Clear View: 1:100 (≈25 ml per 2.5 L / ~0.85 fl oz per 2.6 qt) Rain-X Additive: ~4–4.5 fl oz per gallon of water (the 16.9 oz bottle treats ~4 gal) Tips Start conservatively on Rain-X; you can add more if needed. Top up with distilled water when possible. If switching from another fluid, run a few sprays to purge the old mix. Bottom line: this combo is an easy, inexpensive one-wipe to crystal-clear upgrade.

### ⭐⭐⭐⭐⭐ Reliable Additive for Better Beading and Clarity
*by M***8 on February 14, 2026*

This Rain‑X washer fluid additive works very well in Arizona conditions and integrates smoothly into my RO‑water windshield washer mix. Adding a small amount to each gallon noticeably improves beading and visibility, especially during dust‑and‑drizzle days. It also helps reduce streaking when combined with concentrated washer tablets and a little isopropyl alcohol. The bottle is easy to measure from, the additive mixes cleanly, and the performance difference is immediate once it’s on the glass. It doesn’t replace a full winter formula, but for hot, dry climates it’s a reliable upgrade that makes basic washer fluid perform much better. Overall, it’s a cost‑effective way to improve clarity and wiper performance without switching to expensive premixed fluids.

### ⭐⭐⭐⭐⭐ Works as described, one of the better washer fluid additives
*by W***R on January 27, 2026*

It is a bit hard to quantify how well this works compared to some other washer fluid additives but over the course of one bottle I think I've noticed a few things. It definitely seems to help the cleaning properties in the winter, especially when you get those spots of frost on the outside of the windshield. I'm also noticing that rain water does Wick off the glass a little bit better but nothing like it would if you used the actual Rain-X product applied directly to the glass. I'm curious to see how well this works once the bugs come out in a few months, will report back on that aspect if it disappoints

## Frequently Bought Together

- Rain-X RX11806D Washer Fluid Additive-16.9 fl. oz, 500. ml
- Rain-X 800002250 Glass Treatment Trigger, 16 Fl Oz - Exterior Glass Treatment to Dramatically Improve Wet Weather Driving Visibility During All Weather Conditions
- Rain-X 5071268 2-in-1 Glass Cleaner and Rain Repellant, 23 oz. (Pack of 1) - Provides a Streak-Free Clean for Automotive Glass While Preventing Sleet, Snow, Ice, and Road Spray Build Up

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.es/products/1490712-rain-x-rx11806d-washer-fluid-additive-16-9-fl-oz](https://www.desertcart.es/products/1490712-rain-x-rx11806d-washer-fluid-additive-16-9-fl-oz)

---

*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-03-11*