Well since nobody else is giving away the spoiler on the 6 hours of technology connections videos( didn’t know there was a third now), it’s to fill the little compartment with the dishwasher manufacturers(not the detergent bottles) recommended amount of detergent and to also add a little bit in the bottom of the dishwasher too to help that pre rinse cycle before the main cycle begins.
I love watching his videos but not everybody does. To those people, you’re welcome
Note that this is only true when not using eco mode, which opens the door right away so you can just chuck the tablet in like a caveman. Mine happens to work well enough in eco mode and the little door tends to get stuck on things, so that's what I usually do.
If your (modern) dishwasher isn't cleaning properly in eco mode, either you have very hard water, or you should clean the filter more often.
If you don't remember when the last time you cleaned the filter is, go clean it now.
I pretty much trust Technology Connections and their advice is to use the machine's smart setting (or whatever it's called on your brand) as the main job of eco is to score well on water and energy usage. Mine has "6th sense" as its second program which is the only program that does a pre-wash
Eco on my machine doesn't dry the dishes well. We have pretty soft water