Try getting one of those sponges that are soft on 1 side and really rough on the other that most people use to clean toilets or sinks with and flip ur sweatshirt inside out and wet it down with warm to hot water then wash it with shampoo (perferably baby shampoo.) Scrub the shampoo into it with the rough side of the sponge scrubbing in circular motions. Then condition it using conditioner, (doesn't matter what kind) scrubbing it the same way.
To prevent it from happening u might want to drip dry in ur house instead of putting it in the dryer. Dryers like to fry soft materials. And just a tip for future references NEVER put fleece in the dryer. It COMPLETELY fries it and makes the fleece hard and custy.
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