Mike,
I am not exper on cleaning a SCT, but I would proabably take it to the experts at Bintel. I dont think the cost is very high, I once enquired on the service and found the quote for a 8" to be very reasonable. Bintel also sell some cleaning liquids that are suitable for this type of job.
One other option to expliore is this stuff
http://www.photoniccleaning.com/
CN forums had a video demo of this from last years NEAF and it was very easy to use, you just spray it on and leave it for a while then peal it off. It seems marketed at the Dob's but i dont see why it would not work on a SCT.
I hope you get the old scope up and running, i hate to see a scope like that sit unused.