I did a headliner Re-glue on a Volvo recently. Took the whole thing out before peeling the fabric and very glad the old foam was literally millions of crumbs.
To remove the old foam/adhesive I used a pressure washer and that was amazing right down to the backer foam instantly. It looked like I was spray painting white over brown.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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