Not economical at our WM. A pint is about $10. No quarts. So that's about $60 for 3 quarts.
this is what I have used since I have owned it (annually), takes about 3qt's of extracting what is in the reservoir, with the front end jacked up enough to turn the wheels back n forth
i just extract what is in the tank, refill with fresh, turn the wheels lock to lock several times, shut it off, repeat for 3qts
after 3qts it should be all nice and clear again. should run about $50 for the fluid.
I don't like to pull any lines off, especially being the lines are basically hermetically sealed at this point, I just use a $10 transfer pump from the auto parts store and a empty milk jug.

