My guess is that all the appliances now use much less water than they used to. So,.......
when they rinse, less water is used and the scum stays on the dishes, clothes, etc. I hate our low flush toilets, low water clothes washer, and low water dishwasher. Nothing we can do about it.
Many folks are making their own soap for these units and then using less soap. I love the Tide Pods but unless I wash a big load, my clothes end up with soap in them.