Power off the iPhone
Remove the case and any screen protector covering the speaker area
Use a soft, dry, clean, lint-free brush to gently brush the speaker grilles
Use a clean, dry, soft-bristled toothbrush for light debris if needed
Tap the iPhone gently against your hand to dislodge loose dust
Use a piece of clean adhesive putty lightly on the grille if debris remains
Use compressed air only with short, gentle bursts from a distance
Avoid pushing anything into the speaker openings
Avoid using liquids, sharp tools, or metal objects
Wipe the exterior with a dry microfiber cloth
Test the speakers after cleaning
Repeat gently if sound is still muffled