If the frame of the grill is wood, i dunno what would be a good way to prevent warping, however, if it is a plastic frame then just take it outside and hose it off.
Back when i used to work in a phone Central Office we used to have to clean out the filters that were at the base of the equipment bays. We just took em outisde and hosed em down, then shook out any excess water and let em dry for a few hours.
I dont see why you couldnt do the same with the speaker grills you have.
If you are real worried about possible damage, go get one of those keyboard cleaner cans that just fire out a bunch of air. grab a vaccume and put on the upholstery attachment, then use the vaccume on one side while at the same time blasting it with one of those keyboard cleaner cans.
that oughtta get all the dust out.
Call some dry-cleaners. Im sure you might find a place willing to do it with thier methods.
Back when i used to work in a phone Central Office we used to have to clean out the filters that were at the base of the equipment bays. We just took em outisde and hosed em down, then shook out any excess water and let em dry for a few hours.
I dont see why you couldnt do the same with the speaker grills you have.
If you are real worried about possible damage, go get one of those keyboard cleaner cans that just fire out a bunch of air. grab a vaccume and put on the upholstery attachment, then use the vaccume on one side while at the same time blasting it with one of those keyboard cleaner cans.
that oughtta get all the dust out.
Call some dry-cleaners. Im sure you might find a place willing to do it with thier methods.