To clean a hairbrush, follow these steps:

1. Remove Hair: Use your fingers, a comb, or scissors to remove all hair tangled in the brush.
2. Prepare Cleaning Solution: Fill a bowl or sink with warm water and add a few drops of gentle shampoo. Optionally, add baking soda for extra cleaning power.
3. Soak the Brush: For plastic brushes, submerge the entire brush in the soapy water for 3 to 5 minutes. For brushes with padded bases or wooden brushes, soak only the bristles to avoid damage.
4. Scrub the Bristles: Use an old toothbrush to scrub the base and the bristles, cleaning off oil, dead skin, and product buildup.
5. Rinse: Rinse the brush thoroughly with cool or warm water, making sure to remove all soap residue.
6. Dry: Shake off excess water, then place the brush bristles facing down on a clean towel to air dry completely.

Avoid soaking wooden brushes fully to prevent damage, and clean your hairbrush roughly every two to four weeks, or more often if needed.