¼ c. vinegar = $0.20¼ c. rubbing alcohol = $0.25 1 Tbsp cornstarch = $0.03 2 c. water = virtually free, except for the water bill part, so let’s say $0.000001 Grand Total: $0.48more
c. rubbing alcohol
c. white vinegar
c. warm water
Combine everything in a spray bottle, and shake well. Shake well before using, too, as the cornstarch might settle at the bottom (and subsequently plug the spray mechanism if it’s not mixed in well).