What kind of acid and what kind of flooring is very important to this !
One of the best ways to clean salt stains off a garage floor is with muriatic acid. Use a light solution or follow the instruction on the bottle.
Sorry, battery acid stains are permanent. The acid will eat away the cloth.
bleach stains cannot be removed.
With a replacement floor.
Stains from chess board can be removed by using amonia which is present in glass cleaners.
Cosmetics stains are very hard to remove. I had a bottle of concealer spill on my bathroom floor and I was never able to have it removed. You can try scrubbing the area with baking soda, baking soda is great for everything.
Bleach may work on some stains. It really depends on what the floor is and what the stains are.
It will depend upon what the stains are, but CLR is probably the best first choice, especially for "hard water" type stains. It is an acid, albeit fairly mild; so any finish on the terracotta, anything to make it shiny, might need re-application.
A wooden floor is easier to clean with a mop and it gets stains out faster than a carpeted floor. Carpet has a lot more stains and messes which is harder to clean.
Baking soda is the best way to remove acid stains from concrete. Dawn may remove grease stains from concrete. Vinegar is another great solvent for grease stains.
Acid stains can not be removed from High Pressure Decorative Laminate such as used on counter tops. The Melamine surface is susceptible to attack from acids especially strong acids like HCL and H2SO4, less so from organic acids. The attack not only stains the Melamine but generally bleaches the colour of the decor below. This either leaves a white or light patch, these can not be repaired or removed although they do not affect the properties of the laminate other than appearance.
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