The phrase "tough stains" refers to stains or marks on something that are difficult to remove or clean.
Sentences with «tough stains»
This is great for removing tough stains like coffee from clothing since it's designed to do the same for your teeth. (thebalanceeveryday.com)
However, for tough stains on clothing, this product certainly holds its own and many parents are incredibly impressed with it. (wetheparents.org)
This stuff doesn't eliminate odors, but when I have a seriously tough stain on my carpet or upholstery, this is what I turn to and it never lets me down. (policygenius.com)