Years ago got a call from a carpet store to check into a spot issue on some carpet he sold. Went to the home and it was a berber, olefin nylon blend. The problem was all the color was missing in a spot from just the nylon, don't remember what she said the spot was the tried to clean. She swore all she used was white vinegar, and she wanted her carpet replaced. I told her before the mill would replace anything they would send a certified inspector out to look at it and that in a case of color loss such as hers the first thing he would do is test for the presence of chlorine bleach, if no dye altering chems were found and it was determined to be a flaw in the carpet they would probably replace it. Retailer said he never heard another word from her after my visit. Classic example of a person wanting to place the responsibility of their negligence on someone else.