Turn that smelly fur into soft gorgeous spinning fiber - without felting or matting it too much!
Step 1: Bag it up!
Place the fur into nylon mesh lingerie bags (or any netting-type bag that can be secured closed). Don't put too much in, you're going to need to have some room for water and soap to circulate. Gather a bottle of dish detergent (Dawn works well, but I prefer the industrial size gallon bottle of cheapo stuff) and head to a laundry tub or a bathtub.
Step 2: Get hot and soapy!
Turn the temperature on your water heater up, if possible, and fill your tub up with some super-hot water - you're not going to want to put your hands in this!!! Be careful of course not to burn yourself or splash yourself with the hot hot water...
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!
Add the bags of fur one at a time, gently letting them float onto the surface of the water. They will float on top - this is normal, let them sit for a minute, then use a gloved hand to gently turn the netting bags over, which should cause the fur to submerge into the soapy water.
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...
Step 4: Ta Da! Grossness!
When you return, the bags should be floating in a dirty icky smelly soapy water solution... and your laundry room or bathroom will smell like a wet dog that had a dishwashing habit. Don't panic...