Went to Harbor Freight to buy a set of scrapers in various sizes for getting in some hard-to-reach spots:

The heat gun, wire brushes, and scrapers I am using to remove the seam sealer.  Not pictured is the lacquer thinner can that I am using to scrub clean after scraping with these tools:

This is the seam sealer I am removing:  Scrape it off and vacuum it up then repeat until it is clean:

These edges take a lot of time and patients:

This is what we are targeting:  No seam sealer:

Also the where the package tray was glued down:

Don’t forget the area by the rear seat – before:

After:I think I am finally ready to scuff the rear section to prep for priming!