How to clean

Short answer

Gently clean the speaker and the leads with a lint-free cloth, slightly damp with either water, 70% isopropyl alcohol, or 75% ethyl alcohol.

Clean your speaker regularly to keep it fresh and last longer. 

Unplug any leads before cleaning the speaker and make sure everything is completely dry before plugging in a USB charger.
Remove the carry strap from the speaker and clean it with a soft brush.
Gently clean the speaker and the leads with a lint-free cloth, slightly damp with either water, 70% isopropyl alcohol, or 75% ethyl alcohol.
Carefully clean the openings with a dry and soft brush, or a cotton swab.
Do not use any sharp or metal objects.
Do not use compressed air.
Do not use products containing bleach or hydrogen peroxide.
Do not submerge the speaker in any cleaning agents.
Do not rinse the speaker under running water.