I have a Joe Rocket mesh type jacket, so I don't know if yours is similar or not.
I fill the bathtub with about 6 inches of cold water, let the jacket sit for about 10-15 minutes, then genlty hand wash it, until the water turns dark from the dirt.
Drain and refill the tub again, this time I put about half a cup or so of cold water detergent, I've used regular clothes washing detergent on occasion, doesn't seem to harm it, but the instructions on the jacket reccomend a cold water detergent (Woolite).
Drain the water again, and then hold the jacket under the stream of watr to get the large portion of soap out of it, then refill the tub and hand agitate the jacket, changing the water again and repeat if necessary.
Then place it on a sturdy hanger and let it dry.
After this procedure , it should be 'meadowy fresh' !!!