I've just bought a second hand road bike. Everything works fine except that I can't get take the front wheel off.

The quick release lever opens and closes fine, but the front dropouts have lawyer lips on them and the quick release doesn't open wide enough to clear them. I need to loosen the cap on the other end of the skewer further but it will only jiggle back and forth a tiny bit and not actually unscrew.

I've tried using regular oil to no avail. Other than resorting to WD40, is there anything else I can try?