Refurbishing the Interior on Old Bird

[Jack & Donna Smith]

It seems the former owner of our 1973 Bird papered the wall area behind
the dinette, and the wall next to the sink. We have the paper off, but
there is some type of thin white paint on the wall. What can we use to
remove this that will not affect the "Natural Wood" factory finish?
Paint Thinner, Alchol, Acatone, or Laquer thinner come too mind...
What to use that will not dissolve the factory finish??
Sanding will work, but it is very slow, and there is the danger that it
will gouge the finish.
Has anyone covered these areas with anything that looks good, and if
so, what?
Jack Smith
1973FC31
SoCal