In my case I got a bottle of a brand called “Method” Use the first time and then replace with my favorite brand. I measure once, and now I know (and it is written in the bottle) that it is 4 pumps for Tide, 7 for Downy, and 5 for Clorox. I never again need to measure or create a mess around the washer.
i.e. The hardest part after emptied the bottle was to discover how many pumps I need for each product. (Pump into the measuring cap only once)