I've been working on my "new" used camper for about a month now. It's a bit of a "fixer upper". They had thought the roof was leaking but I found it was the A/C unit was loose. The gasket looked fine so I snugged it down. I scrubbed the exterior tent material and I'll have to scrub the inside next. I'm working on the roof now. I've washed it down with a mixture of car wash soap and simple green. It removed a lot of the dirt. I'm finding dried sap over much of the roof. I tried all the easier methods listed but no luck. I think I will now try the rubbing alcohol spot by spot. My first question is how to clean under the A/C unit ? There is only about a 1/2 to 3/4 inch opening all around. Should I remove it or is there an easier method ? My second question is regarding the full door. All the twist nobs that hold the door in place are riveted in and many are loose or the metal fatigued. Has anyone found a way to re secure them ? I did a search for both questions but found little or no info. Thanks in advance.