A lot of time they put "dry clean only" on fabrics because they don't want to be responsible if the fabric has a problem in the wash. Dry cleaning is the cleaning of garments, fabrics, draperies, etc., with any of various chemicals rather than water. So "dry" does not mean dry. Do a test piece of fabric like others have said above.
I once bought my first pair of silk panties. Put them on, got dressed in a jumpsuit, and noticed that the tag in the panies was scratching me. Got undressed, took off the panties, and red the label. It said, "Dry Clean Only!"
Went to work and told everyone and we had a good time discussing how you would give your panties to the dry cleaner each week. I ended up just throwing them in the sink and washing them with detergent and water. Never had a problem.