This is extremely minor compared to the fire itself, but I've been wondering why the dealership would use a dry powder extinguisher, instead of CO2, on a customer's vehicle for a Class B fire. Sure, a dry chem works, but look at the mess. A CO2 would work just as well and leave little to no residue.
BTW, the powder in most dry chem extinguishers is sodium bicarbonate (baking soda), potassium bicarbonate (very similar to baking soda), or monoammonium phosphate, all of which become corrosive when they become damp/wet. If you haven't done so already, do a through cleanup.
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