The technique I used on a few hundred of these discs was alternating between
simple mineral oil and a soft sponge to work it in, and Windex to remove it
(using a different sponge), rinsing with distilled water. Each disc came out
remarkably clean visually, audibly, and provided a very clear transfer. 

However, before using this on a given disc, I had to inspect the edges
carefully to make sure the lacquer coating was not peeling away from the
metal core. If it was, I had to be extra careful not to get any moisture
underneath. I did not lose or damage a single disc. 

Jeff


On Sat, 18 Apr 2015 10:55:59 -0400, Doug Pomeroy <[log in to unmask]> wrote:

>Tom,
>
>Duane Goldman's product is excellent, and I'm glad to learn that he
>now makes available (?) a stronger potion, since the regular version
>is not very effective on extremely heavy fatty acid deposits, even with
>repeated applications.
>
>I can tell you ammonia (active ingredient in Windex) does work, but it
>is not as effective as mineral spirits (paint thinner), or naphtha (Ronsonol
>lighter fluid).  Be careful not to breathe the fumes!
>
>I have used all these solutions and have never noted any deleterious
>effects on the lacquer, but I've not made a scientific study of the matter.
>
>
>
>Doug Pomeroy
>Audio Restoration and Mastering Services
>193 Baltic St
>Brooklyn, NY  11201-6173
>(718) 855-2650
>[log in to unmask]
>=========================================================================