You should remove the Vive Deluxe Audio Strap cushion to clean it.
Replacing the earphones on the strap
VIVE Deluxe Audio Strap
HTC Viveデラックスオーディオストラップ
About the VIVE headset
Tips for setting up the base stations
Adapter Compatible with Meta Quest 3 Accessories, Perfect for Connect HTC Vive Deluxe Audio Strap Adapters and Quest 3 Replacement Strap : Video Games
HTC Vive Deluxe Audio Strap Review
Adapter for Installing The HTC Vive Deluxe Audio Strap on Oculus Quest 2 Gen/Adapters for Oculus Quest 2 Gen Replacement Strap-White Color (Designed for Quest 2 Gen) : : Video Games
HTC Vive Deluxe Audio Strap Pictures And Impressions - GameSpot
HTC VIVE デラックス オーディオストラップ - PCゲーム
VIVE Support