Rustproof, Now defrost doesnt work
 

I just got my rustproofing done today, and I noticed my rear window defrost doesnt work. Anyone know why this could be ?
Is there a wire that does from the dash to the rear window ?
Could somehthing have gotten disconnected, or a wire cut ?

fuse?

well yeah, all wiring goes from the fuse box to wherever it terminates.... so get your multieter out and check continuity from the fuse to the switch, then from the switch to the defroster lines

are there any common points I should check ?

What he said.

Dont bother with all that work. When they spray your 1/4s they remove any trim thats there and spray the oil in there, either a) it shorted something out, so check fuse and replace if blown, or b) some kind of connector, perhaps under the rear tray has been blown apart from the pressurized spraying, just check any connections back that before you go using your multimeter on everything.