i've never had a cum rag. I've just either used a tissue, or my briefs of the day (I wear clean ones each morning after my shower) or in worst case senarios i've wiped it on the bed sheets or slurped it up myself (rare).
I did though live with a guy and one day was doing laundry and thought I'd toss his in too and found under his bed a purple pair of tighties that were so loaded with cum that it sort of creeped me out. I put them back and never mentioned it to him even though we were real cool with each other over that kind of stuff.
Also lived in a work camp with a guy who had a pair of undies that were really stuck together with many loads. At this point I was starting to think maybe I was the one that was weird. But I got over it. hehe