<<,
My shortest and highest volume tunnel uses all filament. Need to clean cars in a short space with a fast line speed.
I have foam on one top brush at another location primarily because I inherited it. If space permits I would choose a good mitter over the top brush any day.
I use regular cloth because it gets the job done since I have plenty of equipment so there is no need to spend more $ on higher priced and supposedly more effective material. These other locations have double wraps and triple mitters. as well as 2 pair of lower detail brushes. One location also has high side wheels.
I have recently put filament on the lower portion of the high side wheels because I notice my filament place got pretty good wheel cleaning with no high pressure. (Yep, the wheels with small recesses and nooks and crannies are still a problem even with a poodle brush) .
I am thinking of replacing lower detail cloth with filament, and maybe even the lower portion of the wraps, when it next needs a change to help with wheel cleaning.