.. Cleaning the Cartridge

There is a duster under the ramp.

Didn't Bozo say he used to clean the tanks? If you used it on the cartridge there is grease everywhere!

There must be degreaser somewhere. Like, outside.

There is degreaser in the chest outside.

You can open it with the key you find on the floor next to the duster.

Yeah, it's that simple sometimes. There are the steel brush and the degreaser in the chest.

If you look at the cartridge you have a skippable minigame to fully clean the cartridge.