Originally Posted by bobsquarepants
Also was thinking...what about liquid fabric softeners? They must share some of the same type of ingredients as Calgon, as fabric softner can be pretty slimey..
Fabric softener will coat the tank with a waxy build up. Clothes washers with this gunky buildup can develop problems with mold. Fabric softeners also build up a waxy coating on fabric - hence the caution not to use fabric softener with cleaning towels. There is a nifty video from Sacramento fire department showing children's sleepers washed several times with fabric softener and one not washed with fabric softener. The one washed in fabric softener goes up like a roman candle.
I found a box of Calgon water softener on the back of my laundry shelf - I'd forgotten it was there! I guess it has a new use.