So, I printed in nylon today, but I didn't clean the hot end very well, and had some PLA schmotz built up in the nozzle. I did a couple of cold pulls with nylon, but it kept coming out dirty. Then I remembered a small engines trick, and figured it was worth a shot.I purposely wet some nylon and did a cold pull with it, and man, did it clean that nozzle like brand new. The steam scrubs the pla off the walls and nozzle very nicely.