05-29-2015, 02:31 PM
In guessing from other posts you have a crb. I would start carrying the compound that excellent supply sells. It's very affordable and is great at pulling this kind of stuff from the carpet. Sprinkle the compound over the lines. Crb the areas really well. Put collection trays on. And pull the compound out with the crb. Then repeat. I have removed some stubborn problems this way. I try to avoid using chemicals that may cause other issues. Stuff sticks to the compound and it is another way to deal with stubborn carpet issues.