we are doing a demo of a building that burned but they want to keep the slab. the reason the building burt is a car fire. they want us to include cleaning the slab. we have not cleaned the floor of yet but i am guessing it is bad. what would you guys use to get the soot and stuff off the slab? have any of you ever done this before? what works? i was thinking a the 3500psi washer we have at the shop and some muratic acid should do the trick.