Shop-vac, dustpan and brush, and a good dust mask!
That's my recollection of lint removal from a southern Arizona cave last year. This was a little show cave, so having the shop-vac available was a good bonus - even with the hassle of running all the extension cords. And talk about working in a haze of fine dust/dirt!
I don't know about current projects, but maybe the NSS Conservation Co-chairs could point you in the right direction?