you are like me, I do not prewash, but I do check any questionable fab with a snip in a cup of HOT water before construction.....anyway....and I also do not wash after completion........not until quilt is actually in need of washing....I air them out every chance I get during the year or run thru air fresh in dryer to remove cat hairs......actually washing cold water with Orvus (at farm stores) and on gentle wash......dry in dryer on med heat for a short time, then air dry completely........no problem. I have never used a color catcher.......