I started the process of de-winterizing today and quickly got stumped . The water pressure from my home supply removed all of the pink from all of the water facets inside and outside until clear water...
You may want to check the traps in the faucets...when we did this (unfortunately at a campsite) a couple of weeks ago we had water in the tub but no where else (33ft TT). Turns out it was debris clogging up the traps. We winterized with an air compressor.