Hmmm! I'm a little disconcerted by the fact there are missing posts in this thread, including No 1, which kinda spoils it a tad. Is there good reason why these posts are missing, other than the fact that the O.P. no longer frequents us?
However, I have eventually got round to trying to remove some lettering from the clerestory of a Bachmann JS coach. I tried just plain meths, with a cotton bud, and it was definitely removing something, but not having the desired effect. I then tried metal polish of the 'Brasso' type, this definitely removed the decal but was removing the surrounding paint even quicker. A bit of 'Percy' (verance) with the Brasso and a finger nail, had a far better and quicker result on the decals and less so on the paint. The final result has all the decals removed, though with just about visible positions in cross-light. I'm sure a light sanding before the re-spray will eliminate all signs.
I have yet to get round to trying it on my original thought of the Accu W&L stock, as in post #2.
Trust this is of use to someone!
Edit : - Just realised that mention of post #2 could confuse some as it was by my previous persona and avatar.