In the screw-making industry, grease is used to carve out the threads on a screw. It’s labor intensive to remove the grease. Enter scumbugs.
ScumBugs is 50-gallon buckets of water with microscopic ameobas that eat the grease off screws. A product sold to the machinery industry, it had to be tough, but not too tough. Hence the nasty–yet friendly–ameba licking this screw.
Design and illustration by me.