DCP,
Just a note to let you know I'm 7 months into my experiment of NOT BRUSHING the cloth. For 2 years I brushed after every session or two (I practice about 2 hours a day), and the cloth looked significantly worn after a few months, and looked hideous after a year. Since I got my new GCIV, I have almost daily just wiped it down with a very moist (not dripping though), lint-free cloth (available at the automotive section at any Wal-Mart - cheap). I occasionally vacuum with a DustBuster, but very rarely. I will tell you that my cloth looks fabulous for as much play as it gets (looks like new except for the little white burn spots from power shots). I think I'm about through with brushing.