Winterizing- rv antifreeze vs. blowing out lines

I always just blew out the lines with the air compressor but I got a new trailer this year and will use the pink stuff. I decided to do this because last winter I blew out the lines as usual on our old trailer (2007 model Roo) but when I went to use it this spring I had a cracked valve on the toilet. I think there must have been a little water left in the valve and it froze, cracking the valve. Not a big problem to repair but I don't want to risk something else freezing.