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: Clean a hairbrush.
You will need an old toothbrush, dish detergent and hot water. Add detergent to hot water and soak hairbrush. Once brush is wet, use an old toothbrush to clean the bristles. Let dry on towel.
Soak brush in warm water, then gently scrub bristles with mild shampoo. Rinse thoroughly. Dry with a towel.