Provide advice on how to accomplish the following goal. Give ONLY the advice, no other words or explanation.
For example:

Answer: <advice, as short as possible; a single sentence!>.

Goal: How to clean a bicycle helmet?
Pour a few drops of dishwashing liquid in a bowl, add water, and dip sponge into it. Clean it thoroughly with sponge, then clean with cloth,  and leave to air dry.
Wipe with a damp cloth, then let dry thoroughly. Use mild soap if needed.