I used a bottle of degreaser and boiling water
last night. I'm sure my neighbors were wondering what I was doing standing in the driveway in the rain wearing hot mitts and shaking the heck out of a big aluminum
Had a lot of dime-sized chunks of black stuff that looked like charcoal come out. Did another boiling water
rinse, and then shook and rinsed with the hose until there was no more rattling of chunks inside. Then I left the hose in it and let it overflow with water coming out all of the holes to make sure everything was clear and flowing.
I can hear the float moving, but I guess I better pull it just to check it while it's out of the boat. That would be the smart thing to do.
Thanks for your help everyone.