"They are just a couple of little surface spots, not a big deal. I'll just grab a cleaning product (hopefully Spot Out) and take care of it. That will get rid of the spot and any odors they may be causing...right?"
"I cleaned that spot last week!" Thats what you're thinking as you look at it as if it were never touched. Returning spots can be a very frustrating issue, but never fear, we are here to give you insight as to why this sometimes happens.