Not sure what you're getting at. I put 3 gal of soft water and 6 scoops of alkaline cleaner and recirc thru the silicone hoses, pump, chiller, and if used the mash tun. where would you put the rubber hose?
Yup. PBW is just fine with rubber and plastics. My initial brew rig only used an MP-15RM pump..awesome for brew-duty but not enough pressure for my CIP ball, so I used a separate high-power pump with a garden hose.