Whether you're dealing with a fresh foundation stain or one that's been set in for a while, there are a few things you can do to get it out. First, try blotting the stain with a clean cloth or paper towel. If that doesn't work, you can try using soap and water or a gentle laundry detergent. For tougher stains, you may need to use something stronger, like rubbing alcohol or vinegar. Just be sure to test any cleaning solution on an inconspicuous area of the fabric first to make sure it won't damage it.