Doing this with a Merc is fairly retarded. I would only consider this with something that I know there is nothing that can get hurt. Would I do it in my current car? No, because everyone knows the airbag module is under the passanger seat. Not even counting the door electrics, but the only battle you have there is corrosion in my case.
Would I do this in my old Tempo? Sure. Unbolt the seats, blast the carpets, shopvac it out, and rock and roll.