I'm looking for advice on how to remove various marks/stains from these window boards so that I can varnish them.
The marks/stains are a combination of grease(?), emulsion and ingrained plaster dust.
No amount of sanding with 180 grit paper is having much positive effect.
The marks/stains are a combination of grease(?), emulsion and ingrained plaster dust.
No amount of sanding with 180 grit paper is having much positive effect.