Remember the purpose of the solvent is to dissolve the adhesive or at least break the bond with the substrate. You have to get all the dissolved/loosened adhesive off the substrate before the solvent evaporates or it will just remain on the surface.

So work a small area at a time, keep it wet with solvent, and be sure you get all traces off the substrate before the solvent tries.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech