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You may use muriatic acid to clean tile or slate floors if you encounter stains on them. It will need to be diluted in order to be useful.
Oxalic or Muriatic Acid diluted with water will remove rust stains from a roof. Here in Tampa, Muriatic Acid is common, used for swimming pools. Diluted 1 part acid to 4 parts water, it will remove rust stains off a roof. Plain Vinegar is a mild acid, and should be tried first! You may have to apply several applications of it, but we here at Apple Roof Cleaning Tampa suggest you try it first ? More roof rust stain removal info may be had by going here http://roof-cleaning-institute.activeboard.com/
Muriatic acid is a dilution of hydrochloric acid. It is used to clean bricks of the lime stains from the mortar that holds them together.
The best way to remove stains froma porcelain sink is to use a diluted bleach compound. The bleach should be diluted in water, at about a 2 to 1 ratio. This will remove the stains without damaging the porcelain.
Drain pool and clean with muriatic acid
Mr.Clean.
It should work, Try a small test patch before getting over comitted however.
I this might be your problem. Hard water deposits can accumulate on the sides of the toilet bowl. Then if you clean the toilet using something like Vanish, which turns the water blue, it can cling to the mineral build-up on the bowl. Kohler does not recommend using Vanish. To get rid of these stains, you can try some muriatic acid (diluted of course.) You only need about a 10% solution. Be very careful so you don't burn your skin or eyes if it splashes; wear rubber gloves and eye protection. The brush you use with the muriatic acid should not have any metal that can come in contact with the acid in the toilet. There are brushes available that do not use heavy wire to hold the bristles. A good cleaner is Zep available from Home Depot. This is a good alternative to the muriatic acid.
Salt does not stain you probably have calcium stains. This can be cleaned with a solution of muriatic or hydrochloric acid. try a test piece first and be careful for your eyes.
I've had some success with muriatic acid- although you have to be very careful & only works if stains not too deep. They sell it in pool supplies.
Diluted peroxide does an awesome job cleaning urine stains.
To get rid of grass stains you should treat the area before washing with diluted hydrogen peroxide or rubbing alcohol. If it is still a noticeable stain try using some Dawn dish detergent that works wonders. Then wash and dry your clothing as usual.