Toyota rav4 sport 2008 - Spare tire zipper cover stuck.

Due to accumulation of minerals and debris, I can't find the way to unzipped the cover and access spare tire. Anybody would have a trick to free this zipper? I tried to spray vinegar and ad lubricants … still stuck.

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I would take a look at

https://www.wikihow.com/Fix-a-Stuck-Zipp...

They seem to know a lot about stuck zippers. I think the key is patience.

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