What should I do about shrinking sweaters

Sweaters are necessary for many people in winter, but sweaters are easy to shrink and deform after cleaning, how to do?

Ironing method
Use a steam iron about 1cm away from the sweater; Then a quick blow-dry with a hair dryer will set the sweater so it won't shrink.

Cooking method
Fold the sweater into a square and place it in a cotton bag. Then put the cotton bag into the pot and steam for about 15 minutes! After taking out, pull the sweater gently along the direction of the fiber while it is hot, and the shrunken clothes will become larger!