You should remove the Vive Deluxe Audio Strap cushion to clean it.
Review: Vive Deluxe Audio Strap
EOL) Foam replacement for HTC VIVE Deluxe Audio Strap - Buy at Unbound XR
HTC VIVE デラックス オーディオストラップ - PCゲーム
HTC unveils deluxe Vive strap with in-built audio - Polygon
AMVR PU Leather Sponge Cover Pad Replacement Compatible for HTC Vive or Vive Pro Deluxe Audio Strap
Attaching Vive Deluxe Audio Strap to the headset
How do I prepare the headset if I'm returning it for repair?
Cleaning the headset lenses
Designed with adjustable earphones, allowing you to enjoy the 360-degree realistic sound in even more comfort and convenience. Features interior
HTC VIVE Deluxe Audio Strap
Leather Sponge Cushion Replacement Compatible for HTC Vive, Pro VR Audio Strap, Washable Flexible Easy Installation - AliExpress
Replacing the earphones on the strap
Vive Deluxe Audio Strap Review – I Can't Go Back
Oculus Quest Mods – Calvin Bui