Hello Museum-L! I am on the Curation Committee for the Laurent House, a Frank Lloyd Wright house in Rockfrod, Illinois that will open as a museum on June 8. We are finishing up some work on the house (new roof, cleaning woodwork, adding UV filters on the windows) and will be bringing the furniture and drapes back in soon. My question, how would you recommend cleaning the drapes. They are NOT cotton, but seem to be made with a rayon/polyester fabric. We do not believe the original drapes were ever washed (the house was inhabited 1952 through 2012) and we would like to do something to clean them due to the built up grime which is noticeable. Any suggestions on the proper way to clean them?