Masturbation is a normal and healthy activity, especially during adolescence. To keep things clean and avoid making a mess, here are some tips you can follow:

• Use tissues or a towel: Before you start, have some tissues or a small towel nearby to catch any fluids. This makes cleanup easier and keeps your surroundings clean.
• Choose the right location: Consider doing it in the bathroom or on your bed with a towel spread underneath you. This helps contain any mess.
• Hand hygiene: Wash your hands before and after to keep clean and avoid infections.
• Be mindful of lubrication: If you use any lubrication, choose water-based ones as they're easier to clean and won't stain fabrics.
• Clean up immediately: After finishing, use the tissues or towel to wipe up and then throw the tissues away or wash the towel.

Remember, maintaining good hygiene not only keeps your environment clean but also protects your health.