There are a few simple things you can do to maintain your headphones.
Caring for your Bose product
To prolong the life of your ear cushions, gently pat the cushions with a soft cloth after extensive use. This will remove any oils or perspiration that may remain on the cushions
Make sure that the earcup ports are clear of lint, dust and debris. Do not allow moisture to get inside the earcups
Periodically wipe the headphones with a damp cloth
To maintain the headphones, wash the exterior using a soft cloth slightly dampened with a mixture of washing-up liquid and water