Hey hey, looking good!
Same thing is going on with my Philco metal cab roundie, the CRT gasket has this icky goo coming off it but I don't care that much about it to go fixing it. Besides, the convergence is *perfect* and I'd kick myself if I disturbed it for something as trivial as lens cleaning. It's annoying- stupid free Philco has better convergence than any other roudie I own, though I have the CTC-7 very very close.