[R-390] Removing 390 non-a varnish

[Dan Merz]

Hi,  sure this has been discussed before - on a 390 non-a i.f. chassis,
there's what appears to be varnish on many of the solder joints (not
all,  none on selectivity switch).  I am doing considerable connection
modification to convert the filaments to the 390a  6 volt hookup.  Is
there an easy way to clean this stuff off prior to applying the iron?  I
have some solvents such as acetone, laquer thinner and alcohol.  This
stuff appears to be selectively applied to various connections and not
sprayed over the entire chassis though I can't be sure,  Dan.