I then immerse small batches into HOT soapy water
I then rinse in HOT water multiple times (without agitation) in order to remove all soap and dirt. Between each step, I put the fleece through a spin cycle to remove excess water.
When the fleece is completely washed and rinsed, I pick open the fibers by hand and lay it out to dry.
This is the process I use to wash and dry my fleece.