I am advised by others who have used the rental machines that the Bissell cleaning formulas work best. Should I use Professional Deep Cleaning Formula or the Fiber Cleaning Formula?

Answer: BISSELL 2X Professional Deep Cleaning Formula is our premium deep cleaning formula. It does a great job while used with any of our upright deep cleaners. It tackles everyday messes and heavy traffic areas. Most importantly, it includes Scotchgard™ protection so you will be protecting your carpet and upholstery from future stains each time you deep clean.