I Hope it Doesn't Make Your Teeth White, Troubleshooter
The Troubleshooters have a mission to get a corridor mistakenly painted white back to its original colour. This is proving trickier than expected, for various reasons that are beyond their security clearance.
'Maybe we can scrape the paint off the walls? We don't have many tools, but I do have a toothbrush. I'll use that!'
It's a successful action! The toothbrush cleans the wall really quite well, giving it a nice sheen.
'Huh. It's almost like it's painted on.'