Clean up the spill and throw away the trash!
Maxwell is in a room with a janitor with two things to clean.(Why can't she clean it up her self?)
Put the banana peel into the freezer, and either clean up the oil (using things such as Soap) or burn it.
A glitch is to put the banana peel into the freezer, get it out, let it unfreeze, put it back in the freezer. Starite appears.