Dish Soap vs Baby Soap for Window Tint: Slip Solution Recipe

Quick answer: For window tint slip solution, mix about 8 pumps of baby soap into 1 liter (roughly 1 US quart) of distilled water. Baby soap is the better choice over dish soap, because dish soap can leave a milky haze under the film that takes 10 to 12 days to dry. Use distilled water, not tap water, add a little isopropyl alcohol if you're tinting outside in freezing weather, and clean your spray bottle every day.

That's the exact recipe Adam teaches students at Tint Academy, and it's the one shown in our newest videos below. If you're asking "can I use dish soap for window tint?" or "does tap water really matter?", this guide covers both, plus the two habits that stop soap gunk from ending up in your film. Want to learn it on real cars? See our 2-day hands-on window tint course.

Watch: How to Make Window Tint Slip Solution

In this video, Adam fills a spray bottle with about a litre of distilled water, adds 8 pumps of baby soap, explains when dish soap works and why it can leave a milky haze, shares a cold-weather isopropyl alcohol tip, and shows why you should clean your bottle every day.

What Is Window Tint Slip Solution?

Slip solution is the soapy water you spray on the glass and on the film's adhesive during a wet install. It lets the film float so you can position it, then you squeegee the solution out to lock the film down. The IWFA automotive installation guidelines describe this same wet method, with a water solution sprayed on the glass before the film is positioned. Because the solution sits between the film and the glass until it dries, what you put in the bottle shows up in the finished job.

Step-by-Step: The Slip Solution Recipe We Teach

Step 1: Start with distilled water, not tap water

Fill your bottle with pure distilled water, not tap water or spring water. Distilled water has no calcium or magnesium, so nothing dries out between the film and the window. Tap and spring water carry those minerals, and anything left behind ends up trapped under the tint.

Step 2: Add 8 pumps of baby soap per liter

Use 8 pumps of baby soap per 1 liter of distilled water. You can go as low as 6 or up to 10 to 12, but 8 is the number we teach our students. Baby soap doesn't have a lot of chemicals, so the film cures nicely on the window. If you want to see what happens at the extremes, our guide on how much baby shampoo to use in window tint slip solution compares too much and too little soap side by side.

Step 3: Add a little isopropyl alcohol in cold weather

If you're tinting outside in winter, add a little isopropyl alcohol so your solution doesn't freeze. That matters a lot in Canada and the northern US this time of year, especially for mobile tinters working in driveways and unheated garages.

Step 4: Clean your bottle every day

Rinse and clean your spray bottle out every day so soap gunk doesn't spray into your film. Old solution and residue in the bottle are an easy way to get specks under the tint; our post on stopping window tint contamination, bubbles and specks covers the other common sources.

Dish Soap vs Baby Soap for Window Tint

Dish soap works, but it can leave a milky, hazy cloudiness between the film and the glass that takes 10 to 12 days to dry. Baby soap doesn't. For a customer, a hazy window for a week and a half means questions and possible callbacks, which is why we teach baby soap as the default.

This short recaps the dish soap haze problem and the two pro tips: a little isopropyl alcohol for outdoor winter tinting, and cleaning your bottle out every day. If you use a particular brand of baby shampoo, it's worth testing a fresh bottle when a formula changes; we covered that in whether the new baby shampoo formula affects window tinting.

Choice	What we teach	Why
Water	Distilled	No calcium or magnesium left to dry under the film
Soap	Baby soap, 8 pumps per liter	Fewer chemicals, so the film cures nicely
Dish soap	Works, but not our default	Can leave a milky haze for 10 to 12 days
Cold weather	A little isopropyl alcohol	Keeps the solution from freezing outdoors
Bottle	Clean it every day	Stops soap gunk spraying into your film

Common Slip Solution Mistakes Beginners Make

• Using tap water because it's convenient. Switch to distilled for every install.
• Eyeballing the soap. Count your pumps so every bottle behaves the same way.
• Reaching for dish soap and then dealing with a hazy window for days.
• Letting solution freeze on cold outdoor jobs instead of adding a little isopropyl alcohol.
• Never cleaning the bottle, so residue ends up in the film.
• Leaving streaks behind on the door panel and glass after the install; here's how to remove streaks after window tint.

Learn the Full Wet Install Hands-On

Mixing the solution is the easy part; using it well while you position, squeegee and finish film on a real car is what takes practice. Tint Academy's window tint course is 2 full days of in-person, hands-on training in small classes, no previous experience required. You work on real vehicles with professional ceramic film, take home a professional tool kit and a 100 ft roll of ceramic window film, and earn Tint Academy certification. After class you get the online course, lifetime mentor support, supplier access and re-attendance. Over 10 years, Tint Academy has trained more than 7,500 students.

Researching your options? Read how window tint certification works, or start with beginner window tinting practice drills you can do at home.

FAQ

What is the best slip solution for window tint?

The recipe we teach is distilled water with baby soap: about 8 pumps of baby soap per liter of distilled water. You can go as low as 6 or up to 10 to 12 pumps, but 8 is our standard.

Can I use dish soap for window tint?

Dish soap works, but it can leave a milky, hazy cloudiness between the film and the glass that takes 10 to 12 days to dry. Baby soap doesn't, which is why we recommend it.

Can I use tap water for window tint slip solution?

We don't recommend it. Use pure distilled water, not tap or spring water. Distilled water has no calcium or magnesium, so nothing dries out between the film and the window.

How many pumps of baby soap per liter for window tint?

8 pumps per liter is the number we teach students. The workable range is about 6 to 10 to 12 pumps.

How do I stop slip solution freezing when tinting outside in winter?

Add a little isopropyl alcohol to your bottle when you're tinting outside in cold weather so the solution doesn't freeze.

How often should I clean my tint spray bottle?

Every day. Cleaning it out daily stops soap gunk from building up and spraying into your film.

Ready to Tint Like a Pro?

See upcoming window tint course dates and cities across Canada and the USA, or go straight to the 2-day window tint certification course to pick your city and date.

Questions? Call or text: 321-364-9518 (USA)
Call or text: 289-201-2070 (Canada)
More tips on our Tint Academy YouTube channel.