What's the best way to remove superglue from plastic?
A threaded plastic tube snapped with not enough grip to unscrew the threaded
part - so I superglued them back well enough to remove the threaded part,
but couldn't get the two faces to mate in perfect alignment.

I now need to remove the superglue so that I can re-glue them with a perfect
fit between the two parts. The first part of this is to remove the dried-on
superglue.

Any suggestions?