For standard weekly cleaning, mix 1 gallon of hot water with 2 tablespoons of your favorite gentle dish soap. Choosing a soap that contains a grease-cutting formula works great for removing soap scum. A soft wash cloth or sponge can be used for scrubbing, followed by a thorough rinse with clean water.
For deeper cleaning, mix 1 gallon of hot water with ¼ cup of baking soda and ¼ cup of ammonia. Ammonia is great for getting rid of heavier deposits of grease and soap scum. Use a non-abrasive sponge for scrubbing. Rough sponges or steel wool should be avoided, as they will scratch the surface. Rinse well with clean water, and dry thoroughly with a soft cloth after cleaning.