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 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 The 3 inch tool on my 1400 Series Little Green® sprays too wide. What should I do? How do I attach the bare floor tool for my QuickSteamer? My BISSELL SpotBot® is leaking out of the bottom of the machine. What should I check to resolve this? My 1400 Series Little Green® is leaking. What should I check?