While cleaning up my ride after getting caught in a nasty rain storm, I noticed a sloshing sound from water apparently collected inside the hollow sections of the rims. Talking with some of the other riders this seems to be a common problem particuarly with deep section rims where there are large voids and several ounces can accumulate. Are there any secret tips for getting this water out easily & quickly? Even after deflating the tire and loosening the bead, it takes some effort to drain it out.