Thomas Conroy via OldTools wrote:

> Back to the point, a conservator will use water (or, actually, damp on a paper
towel); then detergent foam; and slowly up through alcohol to rougher solvents
if you actually must.

Interesting - a lot of museum conservation is done with manual mechanical
methods (picks, scalpels etc), because they can
be stopped instantly. Any solvent (even water) can be hard to STOP.

I guess books (perhaps fabrics too) require different methods.

  BugBear