Question: How do you know if you should clean your video game cartridge?
Options:
if you open up the cartridge and there is a lot of visible dust,  or if your video game is not playing then you should probably clean it.
It a lot of time has passed since you have cleaned your video game, or if you have handled it a lot then you should probably consider cleaning it.
Answer: if you open up the cartridge and there is a lot of visible dust,  or if your video game is not playing then you should probably clean it.