I start with the tank as it needs to be drained, rinsed and then set aside so water in the tank can run to the drain ports for sucking out at the end.

Drain the Dirty and Clean ports. If you have just done a cleaning run, there should be very little water from the "Clean" port and very filthy water from the "Dirty" port. Re-fill both ports with clean water and close the ports again and slosh the tank horizontally and then re-open the ports and drain the tank.

I then flip the tank over and run water into the two oval shaped Cleaning Head ports and the round Dry Port hole. I will even run a Pipe Brush into the dry port hole until it comes out the Filter port. If you are cleaning the tank for the first time from an Ebay purchase, don't be shocked if a large wad of hair and dirt come out.

When done running water through the vacuum port, hold the tank vertically and rotate it so the filter port is down and drain excess water from the filter port. Then, stand the tank vertically with the Clean and Dirty ports down so that remaining water in the tanks drains towards them.

I also use a 6" zip tie inserted into the oval shaped Seals to Cleaning Head ports to push crud into the long tube between the vacuum and filter ports.