I have presta valves, and I got tubes with green goo about a year ago. I didn't ride my bike a lot, but I'm riding it more now, but the rear tire can't inflate or deflate. It's full enough that I cant get the wheel tire off the tube, but flat enough that it's hard/dangerous to ride. I'm thinking the green goo clogged up the valve somehow, but I'm not sure how to fix that. Is there a way to get the tire off the tube while it's still mostly inflated? I have thought of trying to poke a hole in the tube somehow, but I can't lift the tire away to do that.