Techniums had a following, way back when. I think they also had a reputation for cracking, down by the bottom of the seat tube.

Believe it or not, one of the best solvents to bust up old grease and dirty chain lube is WD-40. It's hard on grease but won't harm paint. After that, attack the whole bike with a bucket of soapy water, then put some real lube on the chain. BUT... maybe the first thing you should do is measure the chain with a ruler. It should measure exactly 12 inches from center of pin to center of the corresponding pin 12 outer plates away. If it's more than 12 1/8", don't bother cleaning the chain, just replace it and the cassette.