Try a silicone grease. You can usually find it in the plumbing section of a hardware store. Sometimes it comes in a little tube, sometimes a little tub. A little dab'll do ya. It's a non-petroleum based product. Why this is important is because a standard type of grease that is a petroleum based product, will tend to act as a solvent when put in direct contact with a plastic--which is also a petroleum based product. Over time bad things will happen to the plastic that might include softening or turning very brittle depending on the types of plastic and the grease used. It's also bad on things like neoprene rubber (another petro product) o-rings. Tends to break them down fairly quickly. I use the silicone grease on them also and never have that issue.
I've used silicone plumbing grease on my old analog TM Elite pedals (that I run through a radio shack USB adapter) for years with no problems. That I'm still using those pedals oughta tell you how long I've had em
. I take them apart to clean the pot now and then and re-apply the grease. Just did that about a month ago and everything looks great. I also use it on my CH stick rig, same deal.
Silicone. And you thought it was just for boobies.
