Not polymer grips; I know CLP doesn't much bother anything Glock or Magpul. I'm a fan of keeping everything needed to keep a gun running in an emergency where you'll always have it. Dad kept cleaning tools in his hunting jacket, for instance. Cleaned out mud or a split shell more than a couple times. But I don't have a hunting jacket. My new AK does have Magpul MOE furniture on it. Not exactly how I'd set it up if I was building it, but it's what I got. The furniture has storage compartments in it. So I could spend $20 for a purpose-made bottle that fills the grip and replaces the cap, and end up with another loose part in the spares box... or I could fill one of the little LDPE bottles I've got laying around with CLP and fit a brush, roll of patches, general-purpose tool and chamber flag. So does anyone know if CLP will melt through common LDPE before I make an almighty mess? Heck, let's open this up to any common cleaners and plastics so it's not just a yes/no and closed. What common cleaners, oils and plastics shouldn't be mixed?