We use Dawn dish-washing liquid. We haven't bought laundry detergent in a very long time. There's something about the de-greasing agent in that soap that makes it very comparable in use with regular laundry soap. Also, the ingredients in both are similar to the point where this particular dish detergent will not harm your clothes. We also get every last drop out of the bottle with hot water, but the best part is the price. Just like most every other product on the market, when you buy in bulk you save money.
The crazy thing about diluting the detergent is that if you do it to a variety that is already diluted. Then you pretty much are just washing your clothes with dollar tree perfume. Very weak and leaves just weirdness throughout the day.