Step 1: Bag it up!
Step 2: Get hot and soapy!
Fill the tub about 4-5" deep. Add a good amount of detergent, about 1/3 cup or so. You can see the water looks pale urine yellow in my picture, due to the orange soap.
Step 3: Add the fur - time to get smelly!
Don't poke or prod or mess with the bags at all, if you can avoid it. Doing so will cause felting and matting, which is impossible to reverse.
Set a timer for 15 minutes and find something to do...