The trick is to actually hand-wash the cashmere in a baby shampoo (like Johnson and Johnson) or with a mild detergent (like Woolite). You will just want to make sure the detergent or shampoo is even mixed with the water before you put the sweater into it. Then just put the cashmere piece in the water and gently wash it by letting it soak for a couple of hours.
To dry just lay flat on a towel and reshape the cashmere to how you wear it. Warning here! Make sure you reshape to how you wear it exactly, because it will dry exactly how you reshape it. So if there is a wrinkle while wet it will dry with a wrinkle (so leave it as pretty as it looks on you). Now make sure while it’s drying to keep the cashmere away from windows or heat.
Now you may know, but never hang cashmere, it can cause dimples and lose shape over time. Don’t fret because we’re going to let you in on a few great tips on how to store cashmere.
To avoid lines down the middle of the sweater fold it like the stores do by folding each side inward by a third. Then you will want to smooth the arms down and fold in half. Fold in a piece of tissue paper; the paper will help prevent wrinkles. Then to make sure your cashmere sweater will last the test of time you will want to store it in a breathable sweater bag.
Now this is the time you may want to get a professional in to help you out. If you do want to try treating it on your own, below are a few tips.
Immediately after something spills on you try to gently blot up the stain then use cold water and gentle stain remover. Then you want to wash the sweater as normal without extra attention to the stain.