I use pro c-83 I spray it on the carpet and fabric with this product there is no need for a defoamer. I do clean the system with Mytee cleaner. I do not put any cleaner in the fresh water tank.
I use 2-3 oz of a generic deformer In the recovery tank and spray a little on the suction mouth of the wand. I only do this with certain cleaners when they are added to the solution tank. Usually no need for one with low foaming cleaners.