Batman, Roanld, and Dry Bowser Duke it out, and as you can see, Ronald accidentally grabs a useful item
Cleaning Palace was a course in Mario Mart. It was filled with cleaning supplies. The useless items rate is 67%. Many random events will happen in this course, an example is the cleaning supplies on the ceiling coming down and crushing the racers. This was in the Clean Cup.
This thing's a stub. It doesn't appear in dictionaries, so listen up what a stub is: A very small garbage can, with only a little junk. ADD MORE JUNK TO IT SO IT BECOMES A GIANT GARBAGE CAN!