One of my faucets is leaking in my bathroom sink. I have a double-handle faucet set from Delta. I removed the set screw from the cover but, for some reason, the cover still isn't coming off. I tried using a putty knife and screwdriver to pry the cover off but it's stuck. I also used WD40 to try to loosen it but that didn't help either. How much force is required to remove the cover if I keep pulling up on it? Is there some other screw that's holding it that I don't know about? Am I missing one of the steps necessary in removing the cover?
UPDATE: I squirted WD40, CLR, and vinegar into both the handle hole and set screw hole but it didn't help. I expected the liquid to flow down between the cover and the stem/cartridge but it seems like the liquid has no place to go so it comes out the same hole it went in.
I tried using a hair dryer to heat the cover so that it will expand but that also didn't work.
I've also tried hitting up on the cover with a rubber mallet to knock it up off the stem/cartridge. No luck there.
Lastly, I tried to wrap a rag around the handle and used pliers to try to pull up on it but that also didn't help. In fact, even with the rag and the teeth of the pliers covered with electrical tape, it still scratched up the cover.
Is there something else I can/should try? Is there a way to squirt things up from the bottom of the cover to dissolve the dirt/minerals that's holding the handle tight to the stem?