so i tried a little experiment yesterday.
a fouled spark plug.
a box of baking soda
a cheap hand held sandblaster,the kind with a small sand resevoir on top of the gun.
so a little blast,a little shake and another blast.
de-carboned plug beautifully well.
blew off and gave it a blast with brake cleaner.
#2 cylinder came right back.16 hp lawn tractor engine.
sodium bicarbonate is harmless,so no mess to clean up.
i am happy.
will try it on paint soon,i hear it works well,as well as neutralizing anything corrosive.