For the past ten years Iv'e struggled with snaps on the big grey curtain ( windshield, driver & passenger window ). I recently came across an article that recommended oiling the snaps. Sounded messy and dubious. Nevertheless in desperation I decided to give it try. I added a tiny bit of sewing machine oil to the little spring steel wire inside the snaps on the curtain. WOW - what a difference! They now go on and off very easily Wish I had done this ten years ago!