FAQ Search Select a Category BarkBath Cleaning Formulas Cleaning Tips Commercial Products Corporate Deep Cleaners Hard Floor Cleaners Mops, Brooms and Brushes Parts and Accessories Steam Sweepers Vacuums Warranty Web Site and/or go What is the purpose of the Clean Carpet Sensor? Answer: The Clean Carpet Sensor on models #3594 and #3594-M will detect dirt or debris being picked up while vacuuming. The sensor will show red when dirt and debris is being suctioned and will show green when the carpet is clean of debris. Related Questions Why is my vacuum sounding loud? What should I check? Where can I get a replacement brush and brush belt for my BISSELL Go Vac? Why doesn't the power cord rewind fully on my Pet Hair Eraser® or Opticlean® Cyclonic Vacuum? My Momentum® or PowerTrak Cyclonic Vacuum® trips my circuit breaker. What should I do?