Hi Folks, I really, really, will post all the suggestions for cleaning of tombstones. BUT I am still waiting to hear from the "Association for Gravestone Studies". I have had so many responses...it is really gratifying. Some I have received are: 1 Mild soap and water and a soft brush 2 Use a lichincide 3 Don't touch it 4 Contact "Association for Gravestone Studies" (This I have done - will post the answer as soon as it arrives) 5 Lichin destroys....use bleach and water 6 Try white vinegar 7 Contact a monument company The stone I am trying to preserve is over 200 years old. My 5th great grandfather died in 1792 at age 109 years, 6 months and 21 days. I don't want to take a chance and do harm. I will wait for an answer from "Association for Gravestone Studies" then I will post whatever they suggest. I have seen too many stones where the writing is no longer readable. I want to preserve this stone but I want to be sure I do the right thing. Thanks for all the help. Marion Bale