Here is a simple and easy way to clean it, that is, before you wash the t-shirt, soak the t-shirt in salt water for about half an hour, and then it is best to put some softener in it during washing so that it will be washed out. The t-shirt will not shrink.
As for those t-shirts that have shrunk, is there no way to restore them to their previous size? In fact, it is not true. For t-shirts that have shrunk, we can use models or hangers or cardboard to support the t-shirts and then use an iron. Iron the clothes and dry them, so that the t-shirts will basically return to their original size in the future.
Another thing to note is that when washing t-shirts, it is best to choose warm water below 35 degrees. If it is hand-washed, do not wring out all the t-shirts after washing, but leave some water to let the clothes under the action of gravity. After drying, it won’t shrink so easily.