The most effective and safest way to clean velvet furniture is to have it professionally cleaned. However, if you do want to try it yourself, you can try mixing 1/2 teaspoon of dishwashing detergent with water, shake it up well, and apply the suds only. Apply only a small amount, and blot between applications. Be careful not to get the fabric very wet. If this is not effectively removing the stains, try using dry cleaning solvent. Be sure to keep everyone off the furniture for at least 24 hours after cleaning. Once it is clean, I would recommend treating it with Scotch Gard, or another fabric protector to make future cleanings much easier.