No, don't use acetone or the like in a garage; too many pockets &
corners for it to collect the fumes in, even with forced
ventilation.

It's an accident waiting to happen.

Detergents will work, and there are also cleaners made
specifically to remove gas & oil from the concrete - visit a
local NAPA or similar auto goods store.

HTH,

Pop

....
:
: Though much more expensive, and more flamable than gas, Acetone
will
: dissolve darn near anything. Problem with Acetone is it
evaporates so fast.
: Wear a mask, rubber gloves, and provide lots of ventilation.
....