Although, stainless steel is resistant to corrosion, it can still rust. Regular cleaning is necessary to preserve stainless steel.
Soap and Water
Use a mild detergent and warm water to scrub the grill. Do not use a steel or wire wool on stainless. Stick with a soft cloth or sponge.
Vinegar and Baking Soda
Use a cup of baking soda and add vinegar little by little until you have a consistent paste. Apply the paste to the grill using a sponge, and let it sit for about 20 to 30 minutes. Scrub it clean with warm water and a soft cloth or sponge. Rinse with warm water.
Lemon Juice and Detergent
Lemon juice can dissolve rust. Mix the juice with a powder detergent and water until it forms a paste. Apply the paste on the rust and let it sit overnight. Scrub it clean with warm water and a soft cloth or sponge. Rinse with warm water.
Soda contains phosphoric acid that is a main ingredient in many rust removal products. If the rust is on a part that can be easily removed, soak the part in soda over night, rinse with water and scrub the area clean with a soft cloth or sponge.
Commercial Rust Remover
Use a commercial rust remover and follow the directions on the package.