Paper Home

my husband found some neat old papers, one dated 1887--!-- but they are very dirty. they were in a small, hidden room next to a chimney, so i would imagine they are sooty as well as dusty. they're nothing important, just some neat stuff i'd like to keep. if you don't know how to clean them up at home safely, but could point me in the direction of a place where i could find out how to do it, i would appreciate it. thank you!