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Thanks Philip.
I had some luck with the lens that I was trying to repair. In preparation of doing some acid cleaning, I opened the lens cell and found that one of the internal surfaces had an almost oil-like coating on it. This cleaned off fairly easily returning the lens to a very usable state. I was initially convinced that it was one of the outer surfaces.
Prior to this, I used the the hydrochloric acid on a different lens and over a period of 24 hours it was practically destroyed. That lens won't see the light of day let alone the light of a star. The acid had no affect on the glass dish it was in though.
I suppose it is difficult to know the best approach unless you really know what glass you have to start with.
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