did you try directmopsales.com they sale bonnet pads and their inexpensive.

tx Pam. unfortunatley, the green is even less aggressive than the brown BBC's mentioned on the 1st post above.

On my toughest commercial jobs, I have first run either my Cimex or my Orbitec CX-20 using FiberMax pads, to break up as much of the tough soil as possible. Then I have gone back over the area with either a Challenger or the Orbitec with absorbent cotton or mostly cotton pads. I'm not sure you can do much more.