We're using 2" Glidetech Butyl hoses for transferring mash/wash and over time they've become stained from the molasses washes. We use 100% molasses for our rum, and the same type of "film" or "dirt" that is left behind in the fermentation tanks is what seems to be in the hoses as well. We are able to easily clean the fermentation tanks with PBW and a brush ... but not so much the hoses. Anybody have any suggestions as to what chemicals or "pipe cleaner" of sorts that we could run through the hoses to scrub them a bit? Thanks in advance.