Older stains may require 1-3 applications to be removed layer by layer. If the first application doesn't 100% remove your stains and smells, simply reapply another application. Older stains tend to seep down into the carpet and will require more product and more applications.
After applying FurryFreshness, you may notice your smells coming back stronger. This is normal and means the product is working! The stronger smells will only last about 12-48 hours after application. This is caused by the ingredients in FurryFreshness naturally breaking down the bacteria causing your stains and smells and then releasing it back into the air as gas molecules to be evaporated.