Quick answer: The mix ratio Tint Academy teaches for baby shampoo window tint slip solution is 8 pumps of baby soap per 1 liter of distilled water. It is not an exact science — you can go as low as 6 pumps or up to 10 to 12 — but 8 is the number we teach our students. Use generous pumps, and mix them into distilled water, not tap or spring water.
That 8-pump rule is the focus of the new video below, posted today on our YouTube channel. This guide covers why we teach 8, how to work within the 6 to 12 range, and the mix mistakes that throw a bottle off. For dish soap vs baby soap, winter isopropyl alcohol, and cleaning your bottle every day, see this morning's recipe guide: Dish Soap vs Baby Soap for Window Tint: Slip Solution Recipe.
Watch: The 8-Pump Rule for Tint Slip Solution
In this short, Adam walks through the ratio we teach: 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.
The full walk-through is in the video below. Adam fills a spray bottle with about a liter of distilled water, adds 8 generous pumps of Johnson's baby soap, and explains why that mix gives the film a nice tack so it can cure nicely on the glass.
Why 8 Pumps of Baby Shampoo?
In the video, Adam is clear that this is not an exact science, and you have to find out what works for you. The starting point we teach is still a counted mix, not a guess:
- 8 pumps of baby soap per 1 liter of distilled water is the number we teach our students.
- Use generous pumps, not tiny ones, so the bottle actually matches that count.
- Baby soap doesn't have a lot of chemicals, so it has a nice tack and the window film cures nicely on the windows.
In the longer video, Adam uses the Johnson's (Johnson & Johnson) brand of baby soap. If a formula changes, test a fresh bottle before you assume the same handle; we covered that in whether the baby shampoo formula affects window tinting.
The 6 to 12 Pump Range
Eight is the teaching number, not the only number that can work. Adam says you can go as low as 6 or up to 10 to 12. In the recap he also mentions 8 to 10 pumps as a practical band around that standard.
If a bottle feels off, adjust in small steps inside that range rather than starting over with a guess. For a side-by-side look at what happens when a mix goes too far in either direction, see how much baby shampoo to use in window tint slip solution.
Mix It Into Distilled Water
The 8-pump count assumes the rest of the bottle is distilled water. Fill the sprayer with about 1 liter of pure distilled water, not tap water or spring water. Distilled water has no calcium or magnesium, so those minerals are not left to dry between the film and the glass. The why behind water choice, plus dish soap haze and bottle care, is in the dish soap vs baby soap slip solution recipe.
Common Mix-Ratio Mistakes
- Eyeballing the soap. Count the pumps so today's bottle behaves like yesterday's.
- Using tiny pumps. The video uses generous pumps. Light taps will leave you short of the 8-pump mix we teach.
- Treating 8 as the only number that works, or ignoring the range. 8 is what we teach. 6 to 10–12 is the range Adam gives you to find what works on your film and in your shop.
- Counting pumps into tap water. The ratio starts with distilled water. Switch the water first, then count the soap.
Practice the Mix on a Real Car
Counting pumps is the easy part. Using that solution while you position, squeegee and finish film on a real vehicle is what takes practice. Tint Academy has trained 7,500+ students over 10 years. Book a 2-day hands-on window tint class to learn the wet install in person.
You can also start with beginner window tinting practice drills, or read how window tint certification works.
FAQ
How many pumps of baby shampoo per liter for window tint slip solution?
8 pumps of baby soap per 1 liter of distilled water is the number we teach our students. The workable range Adam gives is 6 pumps on the low end and 10 to 12 on the high end.
Why does Tint Academy teach 8 pumps?
Adam teaches 8 as the starting point because it is a consistent, generous mix, and baby soap doesn't have a lot of chemicals. In the video he notes that this gives a nice tack and helps the film cure nicely on the windows. It is not an exact science, so you still have to find what works for you inside the range.
Can I use more or less than 8 pumps?
Yes. You can go as low as 6 or up to 10 to 12. Start at 8, then adjust in small steps if the film's handle isn't what you want. Our too much vs too little baby shampoo guide covers the extremes.
What brand of baby soap is in the video?
Adam uses Johnson's (Johnson & Johnson) baby soap in the video. That is the brand shown, not a requirement that no other baby soap can work. If a formula changes, test a fresh bottle.
Do I still need distilled water if I use the 8-pump mix?
Yes. The 8-pump ratio is mixed into about 1 liter of pure distilled water, not tap or spring water. Distilled water has no calcium or magnesium to dry out between the film and the window.
Where can I compare dish soap and baby soap for slip solution?
See Dish Soap vs Baby Soap for Window Tint: Slip Solution Recipe. That post covers the haze dish soap can leave, the winter alcohol tip, and daily bottle cleaning.
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Watch more on our Tint Academy YouTube channel.
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