I don't have a volt meter to check the voltage output of either of my GGs, but I feel like they're not working up to par. When I run it at 3.7v w/ a freshly charged battery and NO spring, it's producing way more vapor. So I figure that my spring is the issue. Can someone give me a hand with instructions on cleaning it? I've already tried wiping it down with a coarse cloth to no avail :/