I mean, it could be. His old keyboard that’s downstairs does have the same stuff on it…

He’s sort of that ‘adult child’ in that he’s not big on cleaning/maintaining his house and locks himself in his room all day, so I’m going more with the standard hand gunk/fingerjam.

There’s layers of sticky oil splatter dried all over the range and microwave. (he doesn’t have good heat control) The floor only gets cleaned by his mom, and his dad has to help him weed the 5sqft of dirt in his backyard when they visit. There’s also a cockroach issue that he’s apathetic to. (I’ve pretty much stopped using the kitchen after cleaning up after him and am now looking elsewhere)