How often do you clean your old games?

Last night I finally got around to cleaning my disgusting copy of Yellow version. I spilled soda on it about a decade ago and never got around to cleaning it. I don't know why I waited this long but it took me a good 10 minutes to get the top shell off because it was covered in soda. :S I still need to get around to cleaning the board and I also need to fix this copy of yellow because long before that happened it was already faulty. How often do you clean your games? Here's a few images of what that copy of Yellow looked like and then the top shell after I cleaned it up.

I only clean the cartridges when they’re having trouble being read.

I rarely clean my games because I keep them in the case, and my caseson a shelf, so theyjust get dusty. I clean the dust off the cases when I see dust.