Before you get an angry customer for covering their frame and clothes as they brush against it in wd40 how about switching to a silicone spray? If the customer asks about it you just point out its whats in most furniture polishes and no dodgy stickers are needed.It wipes clean easy enough leaving and is kind on draught strips and window rubbers.
When you mentioned that sticker all i could think of you have been watching that moody batman film that was made years ago where he pulls out a can of shark repellant. You guessed it, it had a huge label on it saying " shark repellant"