Wheel Woolie Large WWLG18 18" Automotive Wheel Cleaning Brush Large Wheel Woolies are perfect for reaching deep into wheel barrels, wheel wells and exhaust tips. The large brush head hold copious amounts of cleaning solution. This will be your go-to brush for overall cleaning. Completely metal free and will not scratch. Made of polyproylene, these brushes will not scratch up or splatter like most twisted wire spoke brushes.The soft, dense carpet fibers will hold suds and transfer them to the wheel.