The 30 day stay clean warranty is for those deep down spots that have penetrated into the backing or the under pad and may wick to the top of the carpets during the drying process. There is no need for you or us to get embarrassed over these types of resurfacing spots, it happens more often than one thinks with coffee, soft drinks and pet urine spots. Sometimes depending on weather conditions and relative humidity this wicking can take days or even a week to make its way to the top of the fibers so it can be visible. We fully understand this and have no issues returning to your home and cleaning and rinsing these unsightly spots that just seem to reappear. Your satisfaction and happiness is worth many new clients to us and we also understand this part of customer service.