That's a very good question and what is even more interesting is that I pondered that question yesterday as I groc shopped. I saw Ultra on sale for only $1.00 which was a great deal. I picked up two bottles because I know that the soap just doesn't seem to do the job. I later saw a bottle of dawn dish soap for $2.44 and ended up buying that b/c I thought if I am buying two cheap bottles that don't do the job I am still throwing money out the window.
To answer your question: "too much!" to get them clean, LOL. I usually put a half a cap in and swish that around to make it really sudsy. But, invariably, I switch the water when it's time to do the pots and pans.
Hope this helps.