I just love this particular Cleaning Formula! My wife is sensitive to strong fragrances and I had been using other Bissell Cleaning Formulas that do have a scent, some stronger than others. The 2X Allergen Cleansing Carpet Cleaning Formula solved that problem! Low odor if any at all, and the allergen cleansing properties help with whatever gets into our carpets from the dogs. It is as good if not better than any of the other Bissell Cleaning Formulas in terms of how clean it gets our carpets. I use it in both my Big Green® Machine Professional Carpet Cleaner | 86T3 and our Little Green Portable Carpet Cleaner. The combination can't be beat.