Did the hot water suction thing in the sink. Must have gotten it pretty clean as only a tiny bit of black charcoal came out the nipple.
Thanks for the help guys
You have to take out the nipple to do it. The nipple is too small a hole to do it right.
I use a plastic bucket. How can you do it in the sink? The barrel needs to be vertical when you're swabbing the water in and out.