A friend of mine gave me a large crate of Lego that he found in the house he just bought.
It appears to be several sets from the late 70's. (I spotted the building instructions for the 850 and 851 Technic sets in there.)
Unfortunately that crate also contained a bunch of other stuff, including a large plastic squirt-bottle of PVA wood glue. The bottle burst open and the glue leaked into some of the Lego.
I have about 500 bricks fused together with several booklets of building instructions into a sort of modern sculpture.
I would like to get the glue off, without destroying the bricks, but this glue has been there for 30, maybe 40 years.
The usual approach for dissolving old PVA glue is soaking it with hot water, white vinegar or methylated spirits (in order of aggressiveness).
But would that be safe for the Lego?
As far as I know hot water, if too hot, might soften/deform Lego bricks.
Methylated spirits is, in general, not safe to use on plastics and will probably affect the plastic used in Lego bricks.
White vinegar is, as far as I know, safe to use on Lego.
So I'm thinking of just soaking everything in warm water (say 40 degrees Celsius) for a couple of days and seeing how that goes. If that doesn't dissolve the glue I can try again with white vinegar.
Does anyone see a problem with that? Does anyone know a better way of doing this?