I know a nifty way to get two, sometimes three, extra loads of wash out of that big jug of liquid laundry detergent, looks like this, yes? Of whatever brand, of various sizes. Nearly all manufacturers now make them with an anti-drip hole punched in the rim, so that when you put the cap back on, after measuring out the detergent into the washer, the excess drips back into the jug instead of down the outside.
So what you can do is, when you think the jug is empty, turn it upside down (flip it over, hold it so the jug is resting on your knuckles, like a hillbilly holding a corn likker jug) and pour out through the hole in the rim–there will be at least a couple more capfuls of detergent in there. And if you stand there and patiently hold it long enough, sometimes a third capful’s worth will slowly drip down.