"I'm smarter than that" is featuring laundry detergent today. I'm sure you have heard of this trick, but if you haven't yet tried it I want to assure you it really works!
When you get down to the end of a bottle of liquid detergent cut the handle and drain out the dregs. Just slice through it (carefully of course). I use a steak knife.
Look how much was still in there! (Note: This cup was from two bottles of leftovers.) Even from just one bottle, it's enough for one more load of laundry.
Bonus smarty pants tip: KEEP THE LID!! You might want to measure out your detergent . Especially if you drain out A LOT of leftover soap.