Clean and reuse fouled plugs

^^You can still buy them, import, from "you know where"---China, ebay

I've actually had poor luck. Outboard 2 stroke plugs. Soaked them in acetone, carb cleaner (you know how weak THAT is nowadays) starting fluid, I don't remember what all.

Two strokes always seem to do a great job of absolutely killing the plug, LOL.
Same experience with 2t lawn and garden equipment..