Put on safety goggles and a pair of rubber gloves. Remove any large objects from the urinal by hand, and throw them in the trash. Inspect the urinal to make sure no debris remains.
Using an all-purpose cleaner, spray the urinal beginning at the top and working toward the bottom. Cover the entire inside and outside of the urinal. Wait 10 minutes to allow the cleaner time to soak.
Fill a bucket with water, and dip a soft sponge into the water. Clean the outside of the urinal with the soft sponge. Go over the entire area until all visible marks have been wiped clean, then clean inside the urinal.
Dry the surface of the urinal with a clean, soft cloth. Inspect the urinal to make sure there are no marks and that it has been scrubbed completely clean.