There are a number of good suggestions for products to use, so I will only add a suggestion on a method to use whether you choose something wet or dry.
If using a dry product (baking soda or charcoal)simply place it in the bottom of a large plastic trash bag. If you choose something wet, soak a small towel or piece of cloth and place that in the bottom of the bag. Next hang the strips over the straight section of a plastic coat hanger. Then slide the bag up around the fabric and hanger, gather it at the top and tie in place. You can then leave it hanging and nothing should touch your fabric and damage it. Good Luck!