I recently found several skeins of nice yarn at a local thrift store- it was enough for a sweater. Some of the yarn seemed un-used and some had obviously been knitted and then re-round into a ball. I wanted to get the kinks out so I made skeins on my swift (if you don’t have one you could use a chair).
As you can see in the photos I used fabric scraps to secure the skeins in two places. I then submerged each skein into cold water with a gentle detergent- I used “The Laundress” wool wash. I let the yarn sit submerged for an hour or so and then used plastic clothing hangers to hang each skein from the shower to dry. I like to weigh the skeins down a little with a hanger at the bottom. After these were dry I put them back on the swift which was made possible by the two fabric ties (very important, otherwise tangles!). They were easily wound and are now ready for their second project.