Wool is quite requiring fabric. It easily shrinks and changes shape. There are to good ways to clean it – gentle hand laundry and dry cleaning.
The main problem with wool things is their character. Warm sweaters, caps or trousers are often sweated. You should always wash them before spring storage because mothsand silverfish feed off sweat and stains. It also means that dry cleaning will be probably the most efficient method to protect them.
However, if you don't want to pay a lot, or you just need to clean your sweaters to hang it in the wardrobe and use, you can do the hand wash. First read the label recommendation. Heavily dirty clothes should be then spot-cleaned with a brush. Try to brush the dirt or soil off and rinse it through with clean cold water.
Set the proper water temperature and use the special detergent designed specifically for wool. Then turn the garment inside out, swish it and soak for about ten minutes. Do this until all the fibers are saturated. This will help to stop the woolen item from shrinking. Try not to rub the wool against itself or it will felt quickly. After this time rinse every piece of clothing twice, pressing out all the water. Never hang wet woolen items to dry.
You should better dry it flat, spread in desired size and shape. A folding clothes rack can help. Remove the excess of water with a towel by laying the item on a towel and rolling it up jelly-roll style, squeezing and pressing gently. Unroll then and leave in fresh air to dry.