I wash mine: cold water only, gentle cycle, front load washer once a year. Lay flat on towels to dry. Some shaping required on some garments.
Don't put it in the sun to dry.
I hang pants by the cuffs and that keeps them from shortening much at all. Add weight to them to pull them as they dry if you want.
Will they shrink????????????
Most stuff I own never shrunk or if it did it was so slight it was not an issue. It might shorten the length a bit. But not all wools are created the same so be open minded about trying this method.
I don't use woolite or any other product. My wool cleans easily just water, but then I don't roll around in old gut piles with it on either. I have gotten serious mud in the wool though and the usual blood.
Joshua