Good idea, bad idea?
I'm aware of the windscreen issues that can arise over time from dry rot. However, I've been thinking recently about microfiber for transport.
These wouldn't be used for cleaning anything, rather as a baffle between capsules (in a cigar caddy) for transport. Basically, folded microfiber (think lens/glasses cleaner material) separating capsules, or wrapping for temporary use. If the fiber breaks down, it's likely that the particles would be significantly smaller than rotted windscreen foam, but does the fiber break down that easily?