FAQ Search Select a Category 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 Why is my Upright Deep Cleaner Foaming? Answer: What formula are you using? We recommend only using BISSELL Upright Deep Cleaning formula. Make sure you aren't using any manual formula in the machine because it will foam over. Related Questions My machine sprays water but no shampoo, what can I check? My ProHeat® Self-Propelled's Powerdrive isn't engaging. What can I do? My Deep Clean Premier® is leaving dirty spots on the carpet. What do I do? The Cleanshot® feature on my Deep Clean Premier® will not spray, what do I do?