pressure wash cannon and p21s TAW

i wanted to ask if any of you guys have mixed p21s TAW with good quality soap like optimum, poorboys soap, etc....in there pressure wash canister when using pressure wash cannon. i read in a couple of threads where people posted they were using soap and TAW for the initial rinse. they then used the two bucket method for washing. i wanted to know if it helps remove the dirt. Maybe i should just stick to my soap only. what do you guys think.

 

I've heard APC helps strip the wax/sealant layer. I'm sure it helps remove dirt as well.