how much product do you guys use when putting these through the foam gun?
do yous mix and match etc?

 

No, only use Hyper Wash through the foam gun; add about 1" to the bottom of the bottle, fill to the brim with hot water, reattach injector head, shake to mix up, then you are good to go, adjusting the dial on top to get the foam thickness right. We only use Shampoo Plus in buckets when hand washing.