Has anybody ever tried an enzyme product on filtration lines? On a job today I found the only spotter I had on hand was my Nature's Miracle, the pet stain product. I remembered that last year I was in the same situation, only that time it was shoe polish, and amazingly, the N.M. got it all out. Same thing today. My customer was determined that I get the lines out from the edges of the room and around the registers. Figuring I had nothing to lose, I brushed it in good and scrubbed it by hand with a small stair tool pad. It came out really clean and the customer was very happy. Any ideas on why it worked so well?