oddley enough we have not run across any bad leaked on garages. for the heavy stuff i use oil dry and then use a piece of 2x4 and kinda work that in to break up the chunks and pull more oil out.
if you search online you can mix up stuff out of the kitchen to put on the spill that will soak up the oil. its just best to not use acids to clean something your going to cover with a coating.
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