Use a Hair Dye Stain Remover: Several products on the market are designed specifically for removing hair dye stains. If you've already stained your tub, these products can be very helpful in getting rid of the stain. Simply apply the product to the stain and then scrub it away with a sponge or cloth. How to Dye Hair Without Staining Tub: 7 Tips and Techniques 1. Rinse Your Hair Under Running Water 2. Use a Disposable Bathtub Cover Liner 3. Use Petroleum Jelly 4. Clean the Tub Thoroughly BEFORE Rinsing Your Hair 5. Wash the Tub Straight Away 6. Fill the Tub Cracks with Canola Oil 7. Remove Stains with Hairspray 
Preventing Hair Dye Stains in a Bathtub | ThriftyFun
Yes, hair dye can stain a bathtub. The pigmentation in hair dye can be particularly difficult to remove, especially when it has had time to set in the tub. It's important to take extra precaution when dyeing hair in a tub to avoid staining. Although the sink and bathtub can be made from porcelain, the hair dye can still stain them. That is especially true when there is lots of soap scum on it. The combination of hair dye and soap scum on the sink and bathtub is a nightmare. The stain would be more difficult to remove if these two combined with each other.
Unless you've mastered dying your own hair, both permanent hair dye and semi permanent hair dye can leave behind tough stains. Aside from the stress of trying to remove hair dye from a bathtub, you also have to worry about the tub's material and which cleaning agents are safe to use on the different kinds. Stain prevention is significantly simpler than stain removal. Keep the hair color in a separate area from the restroom if you can to avoid any accidental spills. Do not color your hair in the bathroom, and don't mix hair dye there. Dye splatters may and can ruin your otherwise perfect porcelain tub. 
Removing Hair Dye Stains from a Bathtub | ThriftyFun
In general, hair dye is not going to permanently stain a bathtub, but there are some cases where it can. If the dye is not properly rinsed off, it can leave behind a residue that can be difficult to remove. over time, this residue can build up and cause the tub to become stained. Clean your bathtub thoroughly to make sure there isn't any soap scum left. If there is, it will get stuck to the hair dye thus causing stains. Once your tub is clean, apply a thin layer of petroleum jelly to the tub as a way to keep the color from sinking into the tub. Apply saran wrap to the tub as an extra layer of protection from the hair dye.
The best way to easily and safely remove hair dye from a bathtub is to use acetone, baking soda, or bleach & water. Bathtubs in most cases are made of fiberglass or porcelain enameled materials so you need to be careful and choose a smooth scraping material such as a white rag and a cotton ball. Cleaning bathtub with vinegar Vinegar is a well-known chemical free household cleaner. Instead of using bleach, you can try using vinegar. Remove hair dye out of the bathtub by filling a spray bottle half with bleach and half with warm water and spray the stain until drenched. Let it sit for a couple of minutes and then wipe clean with a sponge. 
How To Remove Hair Dye From Bathtub - Using isopropyl alcohol with a ...
One simple method is to mix equal parts baking soda and vinegar, apply it to the stain, and scrub with a damp cloth. Another option is to make a paste out of borax and water and use that to scrub the stain. You can also try using a commercial cleaner specifically designed for removing hair dye stains. It's common for hair dye to create stains in the bathtub. By following the steps below, you should be able to efficiently and effectively get your bathtub sparkling clean. Though it will depend on the kind of bathtub you have. Getting Hair Dye out of Fibreglass and Acrylic Tubs
How to Get Hair Dye off a Bath Tub: 5 Easy Steps 1 Fill the tub with hot water until it covers the stains: First, put on gloves for personal safety. If applicable, wipe up any puddled hair dye. You can fill the tub with water or turn on the shower to help. 2 Apply the cleaner: Spray, squirt or wipe on the chosen cleanser 3 Acrylic and fiberglass bathtubs are one of the most luxurious bathtubs available in the market. They will need special care for removing hair dye stains. This quick overview on how to get hair dye off a bathtub made from fiberglass or acrylic will be handy for you. 1st way Buy Denture tablets on Amazon 
Clean Hair Dye Stains Bathtub - Eriuakajaan
Answer (1 of 3): Acrylic finishes are extremely resistant to staining, but are not stain proof. The best way to deal with this, in my opinion, is to immediately flush any area that is colored with water and use a gentle cleaning agent if necessary. You do not want to let the area become dry befor. 3. Rubbing Alcohol Rubbing alcohol can also help to remove a hair dye stain. Apply some onto a cotton ball and rub it over the stained area, but keep in mind that this is another method to steer clear of when it comes to wood finishes and painted surfaces. 4. Vinegar and Baking Soda