-Get some crevice tools for the Shopvac. It will help with vacuuming and extracting.
-For tight areas, agitate with your hands or a terry towel.
-For a spot remover, you should be just fine with something that is safe for clothing (IE: Shout Spray)
-Repeat if necessary. For deep stains, just apply the solution and let it sit for about 20 mins, then extract out.