I recently purchased a used set of lens for my telescope. They came in a nice aluminum case with foam inserts, but the foam has an odor. I am currently using just the sun to try to rid the foam of the musty odor. It's slow going. I was wondering if there would be any adverse interaction if I sprayed the ester foam inserts with isopropyl alcohol? I am hesitant to spray anything on the foam for odor removal, for fear any lingering residue may harm the lenses in the long term.
The foam looks like a gray ester poly foam. Bottom is solid, top is convoluted.