It splashes my shirts too but it's the most efficient way of cleaning behind the spokes. They are cheap Kirkland Signature white tees from Costco anyway.
I have most of the now defunct Meguiars brush line but the wheel brush just did not impress me. I found it to be too short to really get to the backside of open wheels and I thought the bristles were just too stiff. I prefer the Motorcycle EZ detailing brush. I am on my second one and will keep buying them...