Mystery of Leaking Front Left Roof Vent Solved

[Steppy]

I purchased my TM last Feb and after some snow and rain, noticed water leaking from the front left roof vent. Yesterday I finally got a clear day to tackle the removal of said vent and base to install it correctly. Lo and behold, the water was coming in through one of the vinyl base butt joints, none of which, BTW had a vestige of any type of sealer or caulking, an omission I lay at the feet of the TM factory. There was plenty of cau
lking gooped on all over the outside of the vent and base, which was ineffective in preventing the leak. From the appearance of the butt joint itself, and the internal rusted clamp holding down the vent to the vinyl base, the leak had been there a long time.
I hate scraping and removing old caulk/sealant. I used a putty knife and razor blade scraper to remove the most and then used Goof Off to remove the vestige. What do y'all use to remove old caulking?

I cut new PVC strips for the base and when it stops raining will be using 3M Marine Adhesive/Sealant 4000 UV to re-bed the base and vent, first clamping the base until it cures, then the vent.

I had similar leaky issues with my 2004 2720Sl TM, again, caused by poor factory installation where the vinyl base was screwed on to the roof without first being pre-drilled, causing cracks in the vinyl everywhere there was a screw. For what these TMs cost new, one would expect better quality craftsmanship. Here's hoping the new TM factory owners take heed.