There are a few things you can use to clean your urinal drain. One is a simple plunger. Just make sure that the plunger is big enough to fit over the drain opening. Another option is a wire brush. You can find these at most hardware stores. Just insert the brush into the drain and twist it around to break up any clogs. Finally, you can use a chemical cleaner like Drano or Liquid Plumr. Just be careful with these as they can damage your pipes if used too often.