It's mostly just smoke damage and fire extinguisher powder. I'm gonna clean as much off tomorrow as I can. I've heard that powder stuff can be corrosive.
Pics:
front part of the inner fender, kinda under the battery
rear part of inner fender liner
blower motor wiring and heater box
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'02 Lexus IS300
'06 Suzuki SV1000: Back on the road and ripping hard as ever!