concrete
#2
#3
muriatic acid. its just pool acid if you know anyone with a pool they can give you some. i mixed mine 1:3 acid water just to play it safe but it works 100%. just dont do it on your driveway do it over dirt or on the street. and dont get it on your tires, it wont eat them but it will cause discoloration
Last edited by ES894x4; 03-02-2008 at 04:37 PM.
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