What I have been told is that fabric softeners are long-chain fat molecules with a polar end that electrostatically binds to fabric and cancels out the charge, and, over time, ends up as a gelatinous mass in a low water washer. Mine was taken apart recently, and it was really revolting. I have begun to use hot water when I safely can and avoid the dryer sheets I used to love. There are reasons there are so many products out to buy to clean up low water washers and eliminate odors. Fabric softener in any form is one.
Hugs,
Charlotte