Why does it not work on "this" stain?
Our formula is very powerful and removes a wide variety of stains. However, there are some stains on some fabrics that seem to be harder to remove than others. Following the Instructions (absorb excess/moisten with water/treat area/ allow some time/launder as usual) can be repeated and significant progress should be made.
As there are so many things to consider with a stain - such as how long it's been there. what it is, has it been previously treated, what fabric is, etc. etc. - it's impossible for any stain remover to remove every stain.