We must unweaving it, then assemble a skein (as when we bought it) with winding or around a chair.
Then wash carefully and hang on the rope without first passing it through the dryer because it is entangled. Once dry, we can wind it again and you're ready to work and make a new fashion piece.
It will be much more smooth and fluffy if, after it has dried and before making tangles, you put it in a wringer on a pot of hot water, being careful not to get wet. You should go turning for the steam reaches all parts of the skein.
This tip is good to recycle your wardrobe from last year and always be modern and current and also for economy in difficult times.