TSA doesn't really care about laundry detergent...
OK let me clarify. I've brought powdered in a baggie. They can tell what it is. Especially if you're using a smelly detergent, they can tell. If you want to bring liquid, put it into the 3.4 oz bottles you can buy (I get mine at Safeway for 99 cents) and put it in your 311 bag. Or just go to the store and buy some if you have a car. Publix carries relatively small containers of Tide and All, and they are relatively inexpensive, I've noticed.