Sometimes spooled yarn is treated to make it slip through a machine better. I suppose you could wind it into several hanks and wash it that way. I remember reading about a product for washing yarn that takes out everything, but can't remember what it is. Maybe someone will chime in with it.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry