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.
the best way to clean you concrete floors is with hot and soapy water and lots of hard work
Pour water
a presure washer is the best way to clean concrete, keep in mind to keep moving the presure washer and not let it just set in one spot for to long.
oil
Often all that is requires is a high pressure sprayer
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.
The best way to clean a dartboard is with a cloth and shining polish.
The best way to clean a suit is to have it professionally dry-cleaned.
The best way to have clean water, is to boil it. Water purifiers are a close second, and although they still clean your water, they are not the best way to have clean water.
The best way to clean clothes is not to get your iron too hot, and use starch.
The best way to clean chenille bedspreads is to soak them before washing them. Another popular way to clean chenille bedspreads is to apply peroxide to them.
With thinset.