Personally I use those Dryell home dry-cleaning bags & clothes for my wool socks and kilts and they seem to do a great job of getting them clean and fresh smelling without any damage or shrinkage whatsoever.

And I did manage to get some shrunken kilt socks back to size. Actually the wound up longer than the original! I took one of those hangers with the two clips and hung one sock from each clip. Then while the socks were hanging I steamed them with my steam cleaner. The sheer weight of the wool caused the socks to elongate back to the proper size. While they were cooling I slipped my arm down them to make sure they widened up enough for my calves, and poof I had my shrunken kilt socks back to size.