I was putting my new grips on my 123s 2 nights ago. I was trying to do it with hot water as a lubricant because i had it handy and i got the grips on about half way where they decided to stop. Try as i might they wouldn't budge. I remembered something about people here using windex to get them on and off so i thought, why the hell not? I sprayed it on and whatnot, put my hand on the grip twisted it and it sent a searing pain into my palm of the likes of which i had not felt since i cut my hand trimming the fat off the prosciutto at my college job and was cleaning the windows later that night. Sure enough, all my attempts at using only hotwater resulted in me removing some skin from little points on my palm. Nothing serious or even noticable at a glance but windex doesn't care.
Long story short, i got those grips on rather quickly with windex. But if you're going to apply grips with windex, let me go ahead and suggest starting with windex and checking you hands before you cover them in ammonia.