Put the sweater in a basin with cold water and a drop of wool detergent. Leave to soak, moving the head a little with your hands from time to time.
Rinse well a couple of times and, after squeezing with your hands, lay the sweater on a towel, fold it and let it dry like this before airing again (see DRYING).
Or hang it when it is not too wet (otherwise it risks warping).
Choose a delicate cycle – If you have a modern washing machine, you can use a hand wash cycle or a wool cycle. If your washing machine does not have a wool cycle, use the cold water wash on the delicate cycle.
Wash at lower temperatures – To prevent shrinkage, wash wool only at low temperatures (below 30° Celsius).
Use a dedicated detergent – Use a specific detergent for wool. Contrary to popular belief, never use fabric softener!
Dryers are not the best for wool products as they tend to shrink them, so air drying is best.
Lay the garment flat on a clean towel, reshape by spreading it out into its normal shape and allow to air dry.
If you washed the garment by hand, first roll it up in a towel and wring it out to remove excess water.
If the wool gets wet, dry the garment at room temperature, away from the direct sunlight or heat.
Most wool garments do not require ironing and often just a little steam is more than enough.
To iron wool, always set the iron to wool mode, always use steam and avoid ironing the fabric when it is completely dry.
If the garment gets stained, treat it immediately with the solution recommended for that specific stain and let it air dry.
In this way it is not necessary to wash the whole garment just for a small stain, saving energy and preserving the material.
To find out more and to find out how to treat individual spots directly, you can visit this site: https://www.woolmark.it/care/