OK, that is stamped concrete. things you don't want to use are a pressure washer. It will blow the release color off the concrete and destroy the area you are trying to save. first you will want to remove any sealer on the the affected area, you can do this with xylene (you can get it right at Home Depot) this won't hurt the concrete or the color, and will re liquify the sealer (if it is a topical sealer) once you have use the xylene clean the area with denatured alchohol to remove any residule sealer, once you have done that scrub with a non caustic cleaner such as simple green. if the stain still remains your best option is to contact somone experienced in concrete and have them remove the small stained area and replace it. I did stamped concrete for years so i know what i am doing with this. if i saw this i would do the things i said and if it didn't ome clean i would use a grinder to remove the small section that is orange and then repour it using a high psi mix hand tinted (id mix and pour samples at home first to verify the correct color to concrete ratio) and then just use a small edge stamp to redo the texture.
wash with a hose and somehow make it shoot water fast
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.
There is no way to get urine stains out of black top driveways. On concrete, bleach can be used, but the stain is never permanently gone.
scrub with a chemical or something u use to clean stuff. It should take it out.
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.
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.
Check with your local hardware store or Home Depot/Lowes etc. There is a special chemical that is supposed to clean everything from concrete.
acid
It depends partly on what is dirtying the concrete. If it's oils stains and other motor vehicle fluids, you need at least 2,500 psi and special soaps.
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Get an acidic somewhat abraisive liquid substance such as hot sause, mix with water and apply to affected area, or try pressure washing.
I would try to contact the company and see if they can come out again for a second time since they left stains behind. I have used tide with bleach mixed with hot water and a stiff scrub brush. I was able to get the stains out with that method, but the stains were only a day old.