Stop in for a cup of coffee

Made some progress on multiple fronts.
The Jeep has coolant back in it, and the oil pan drain plug is (hopefully) not leaking.

Found a can of high temperature paint at the garage which will be perfect for the rusty tinned ductwork behind the mantel.
Unfortunately, the other day I sprayed WD40 all over it.
Suggestions on how to best get rid of it???
I've already used a propane burner and wiped it down with mineral spirits. Will that be enough?