I got two fungus infested lens, one kept in an airtight tupperware box with an old slr.

The other lens is kept in a cupboard, also got fungus, but at a lesser scale compared to the one above. Trying to clean this one up, since the dissasembly seems fairly simple.

Both lenses are attached to a body. Weirdly enough, my 50mm 1.8 kept next to the cupboard lens seems fine. I've since left my 50mm on my desk with plenty of sunlight, but now i have to deal with a dusty camera+lens.

For fungus prevention purpose, is a drybox absolutely necessary? Does it work?