Once you've knitted yarn and frogged it, it's yard
to reuse it with other yarn of the same type and lot
because it has been stretched. By soaking the yarn in
cold water and letting it dry under tension, you will
be able to reuse it.
Unwind the yarn into a hank.
Tie the yarn with in several places with pieces
of yarn 4-inches in length. This will keep the yarn
from getting tangled.
Fill your sink or a small container with cold
Place the yarn in the water making sure that it
is completely wet.
N.B.: If your yarn could use a washing, this is
the perfect time for it. Put some soap in the
water such as Eucala or liquid detergent. Make
sure to thoroughly rinse the yarn by empty the
container/sink and refilling multiple times until
there is no soap left in the water.
Gently squeeze the water from the yarn.
Hang to dry with a weight attached to the bottom
to straighten it out. Don't use too much weight.
Plastic hangers should be enough.
Let the yarn dry overnight.
Once the yarn is completely dry, you can roll it
into a ball with your ball winder.