Yup. If you soak an acrylic stem in rubbing alcohol it will micro fracture. Using a pipe cleaner dipped in high grain alcohol doesn’t expose it long enough to do any damage in my experience. Of course this is my opinion based on watching the videos of a guy soaking Perspex in rubbing alcohol and my years experience of doing it both ways.Just a word of caution alcohol and acrylic stems do not go well together as the alcohol can introduce micro-fractures. Alcohol is fine for use with vulcanite stems, dish washing solution works fine in acrylic stems.