I just had our Class A winterized and was wondering why could you not just blow out all the water lines and make sure you have "NO" water in the RV during the cold months? Yes, I am new at Rving. Gues...
As others, I just blow out the lines, add RV antifreeze to the drains and have never had a problem plus ready to go next year without having to flush out the pink stuff.
Don't forget outside shower or ice maker I think these two items are probably the major reason for frozen lines. OH yeah pull any filters.