The door the tablet’s in doesn’t open until after the prewash.

He tests those as well, finds that they don’t actually do a staged release like that.

No, the dishwasher dispenses the entire tablet during main wash only. Which is exactly why if you use tablets the pre wash won’t have any soap

At least not in the ones tested in the video.

Also, the prewash happens in a cycle, where the soap holder isn’t opened.