Diagnosis
The fabric grille is a non-removable, acoustically transparent material. Standard cleaning methods can push dirt into the speakers or damage the adhesive.
How to Fix It
Use a dry, soft-bristled brush. A clean makeup brush or soft-bristle electronics duster is ideal. Gently brush the fabric in one direction to lift and remove surface dust. Do not apply liquid or pressure.
If That Didn't Work
For sticky residues or deeper stains, use a slightly damp microfiber cloth. Dampen the cloth with distilled water only. Wring it out completely until it is barely damp. Dab the affected area gently. Do not rub. Allow to air dry fully before use.
Heads Up
Never use vacuum cleaners, spray cleaners, solvents, or steam. Suction can damage the speaker drivers behind the grille. Moisture can seep in, causing mold or driver damage. The fabric is not designed to be removed for washing.