To prevent frequent buildup of dust and debris, it’s advisable to keep your phone in a clean, dry environment. Avoid placing your phone face down on surfaces where dirt and particles are more likely to gather. Regularly using a microfiber cloth to wipe the phone’s exterior and speaker area can also help reduce the accumulation of dirt. For deeper cleans, consider using the Android Speaker Cleaner app periodically to maintain optimal sound quality and keep your device in top condition.
https://thespeakercleaner.com/
Best Practices for Maintenance of android speaker cleaner