Handwash only in lukewarm water and mild soap

Best that we can suggest:   You can use

Soak the garment  in suds for about 10 minutes, do not rub or wring. Rinse thoroughly in lukewarm water. Wrap in a towel to excess moisture. Smooth the garment out on a dry towel and pull gently into shape. Never hang sweaters.
If you wish to brush the sweater, you can use:

or similar comb.

You can also access  the dry cleaning specialists servises.