I 4 tablespoons baking soda 1 quart warm water Dissolve baking soda in warm water. Apply with a sponge. Rinse with clear water. Spray on surface. Rinse with clear water.
Ammonia is a toxic ingredient.
Handle it with care and store it safely. Add white vinegar and cover the drain, if possible. Let set for 5 minutes. Then pour a kettle of boiling water down the drain. Lime and Mineral Deposit Remover Soak paper towels in vinegar.