"Auto stains" = oil?
You will never get oil markings off raw concrete. You can clean with a number of solvents (paint thinner, alcohol, etc) and the result will be a cleaned stain.
Stained concrete can be cleaned up quickly with just water and the correct pressure washing technique. Unfortunately, these older and more porous surfaces can also be damaged by the wrong tip or technique more quickly. That is why aside from the regular nozzles used for pressure washers, it is best to use a Pressure Wash Surface Cleaner attachment from bestcargurus in cleaning flat surfaces such as brick and concrete. A pressure washer surface attachment gets cleaning jobs done up to 4X faster than the usual spray nozzles. The splash-free skirt keeps you dry while you clean and you wonβt experience any streaking problems due to its ability to keep nozzles at a fixed height from the surface.
Check with your local hardware store or Home Depot/Lowes etc. There is a special chemical that is supposed to clean everything from concrete.
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.
There are a few ways one can remove wood stain off of concrete. One way is to use a sandblaster to remove the stains. Another method is using wood bleach, water, and a scrubbing brush.
You can clean salt stains off of Nubuck shoes using a solution of water and vinegar. Try and clean the stain as soon as you can for best results.
so you can clean the stains off your clothes
Clean this off with water and a cloth rag or a brush.
Rub the stains with a rag dipped in Goof Off.
bleach and ammonia
acetone and bleach
hydrogen peroxide and cold water
Fresh oil stains from cars can be easily cleaned using dish soap. However if the stains are too difficult to remove using dish soap, you can use water, liquid dish soap, nylon scrub brush and an old towel.
Ketchup and a sauce pad.