Strong NaOH inhot H2O eats aluminum.. So as long as your optics are not KTP,, KDP, LBO etc and are just glass, that is a option.
(aka drain cleaner..)
Watch out for the released fumes. Wear safety glasses
There are solvents for epoxy, but if you have to ask, odds are you do not have access.
THF comes to mind..
Then I see the line about c-mounts... heat might get the indium attach points.. Sorry, didnt read far enough...
Steve
Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...