". . . sprinkle a bit of baking soda into the corners, pour a bit of vinegar into a cup and pour it into the tracks. . . ."
Holy Moly, best carpet cleaner EVER. Just used it on a year-old stain of unknown origins, now the stain is completely gone.
This is the magic recipe the ladies from the Garden Club gave me. If you run into some antique linens and want to make them look like new, here's your recipe.