I've sucked out tweeters with toilet paper rolls before. I'd try that before resorting to a vacuum. My kids are 5 and 6 so for the last few years I've been trying to avoid them damaging my 3.7s. I actually built light frames around them and put them on plywood platforms on wheels. The idea was that I was going to basically Vandersteen them by wrapping the frames with some fabric mesh. I never got to that but the frames consisting of 4 vertical dowels and a rectangle frame on top did a good job of preventing kid damage. Just in the last couple of months I finally got rid of those frames. I think the basic idea is a good one for anyone wanting to make it through the little kid years without a lot of dings or worse. I'm sure you give up a little bit sonically and it doesn't look great but when you've got tiny kids those things are secondary anyway.
