Cleaning condenser lens

[Hane]

I have left my condensers in a box for many years. And now they are covering wit h stain. Can someone teach me how to clean them away. Million Thanks

[Steve Clark]

That`s a job for Windex, the foamy stuff in the spray can.

[Richard Boulware]

I have even taken the double glass condenser lens' out of an Omega D- 5 and put them alone in my kitchen dishwasher, with some Cascade. Worked like a champ! They came out 'squeaky' clean.