Issues with cleaning shag wall to wall carpeting:
- Impossible to vacuum well on location + Owners can't vacuum it well either. In other words it will have a huge soil load (buildup) at the very bottom. Always will require a lot of extra vacuuming that will still not achieve optimal results. Price it in, and plan for much longer vacuuming time. Consider it a meditation- Enjoy

- Due to more fiber, it will absorb more moisture than a shorter pile carpet. As a result drying time may be an issue. Therefore it requires many more dry passes and will greatly benefit from using a fan and creating optimal drying conditions.
- The fiber is wearing on all sides, lays on it's side and moves around. That and the fact that good vacuuming is practically impossible, translates into heavy wear (scratching of the carpet) and a different wear (more on the side and less at the tips of the fiber) than usual carpeting. A substantially different wear pattern as compared to the usual cut pile. It also mats substantially more. End results will reflect these issues.
Therefore it benefits from being conservative with the pre-spray (gets it wetter) and lowering psi, more clean passes at lower psi and many dry passes etc.
The chems are the same (depending of course if synthetic or wool) the application is different.
Understanding these issues and practicing your communicating skills, so that client understands the limitations in advance, may contribute to better long term business relationship not to talk about better sleep at night
