Your headphones need regular cleaning to perform well and last longer. Here's the safe way to do it without damaging sensitive components.
Gently pull or twist off the ear pads. Most over-ear headphones have removable pads that can be cleaned separately.
For fabric pads, hand wash with mild soap and warm water, then air dry. For leather/pleather, wipe with a damp cloth and dry immediately.
Wipe the headband with a cloth dampened with a small amount of soapy water. For leather headbands, follow up with leather conditioner.
Use a dry cotton swab to gently clean the speaker driver mesh. Do not apply liquid to the driver area.