How to clean concrete stains!

kitty litter/absorbite/whatever. Do the twist on it with your boots. It almost turns it to talcum powder, then sweep it. works pretty good like that. White vinegar is supposed to clean rust stains, power washers are pretty cheap nowadays. HF has a 1800 psi for like 50 bucks. That will etch concrete if concentrated. works good on most stains. Those paint tarps are uber cheap at homeless depot, drive your car onto one next time you start spraying stuff.