Best way to clean glossy finish on speakers?

+1 @yyzsantabarbara 

Cover-up is probably the best way to keep dust and moisture out.  If you maintain a good habbit covering the speakers up you will find the huge difference after a few years' use.

I guess she must be more than happy doing so. Make sure though whatever the gadget she is using won’t microscopically scratch the surface please. Someone in this thread even worries about the cover fabric "rubs" the surface more so than abrasive, intrusive cleaning using all of the solutions recommended here.

This sounds like more a commercial ad than a discussion thread. One can potentially avoid these hassle by just using covers. This is how I baby my upright piano. Of couse, be careful with the fabric of the cover that may "rub" the surface of the speakers that the OP is worrying ...

I will be launching a new product line addressing how best to clean and maintain pristine speaker surfaces. These products will be available at your favorite audio gear shops very soon.

This Will include special purpose microfiber towels, distilled water Products, modified swiffer dusting products, specially designed white handling gloves, air blowing Devices to remove dust, air filtration devices to remove harmful airborne dust particles, and polishing products which are under development as they just don’t really exist for indoor pristine speaker surfaces. A surprising product availability gap apparently exists for maintaining speaker surfaces and driver surfaces.

Stay tuned for developing announcements. This will be really really big.