Blue Dawn Ultra, diluted in half with water. One squirt is enough to fill my sink with soapy water and wash a day's worth of dishes. I use a bit to scrub stains on clothes with an old toothbrush, and add a spoonful to a spray bottle full of water to kill off aphids in the garden. I also like that it is mild enough to use on the cat or dog on the rare occasions that they need a flea bath.