I have only been at this about a year and things are going well. One question: I ran across a house that has a really light frieze carpet and has a couple traffic areas and in front of their couch that is extremely dirty. It looked dark when I left, but lightened quite a bit the next day after drying, but is still noticeable. Next step would be what? I have not done any restoration work or have a rotory yet, but maybe that is the next purchase? However, would a rotary on frieze carpet be overkill or bad for the pile? Need some advice. Used my TM, a Matrix tlc and my rinse surfactant at 3gpm. Dried for 15 before leaving. Looked good to me, but you know how those customers are that have NEVER cleaned their carpets and expect miracles. Need some help as I always take care of my customers until they are happy..(at least the ones I want to keep, and this one pays well so help!) 
