You can also get a good qualityh painters 1" or 2" hair paint brush and gently brush the drivers and surrounds. This works for me. That with a can of air should work just fine.
How to go about cleaning my speakers?
I own B&W 805S's and always have the grilles off. I've owned them for about 8 months, and haven't cleaned the actual drivers, just the cabinents and the tweeter with the supplied cleaning cloth. Do I need to clean the drivers? If so, what is the safest way to do it?