Here's how to use and take care of your XENOS The Great Whale Off Kanagawa long - sleeve t - shirt. First, when you're ready to wear it, just put it on like any regular shirt. It's suitable for daily wear, outings, or just lounging at home. When it's time to clean, remember to machine wash it cold and turn it inside out. Wash it with clothes of similar colors to prevent color bleeding. Only use non - chlorine bleach if there are stubborn stains. After washing, you can either hang it to dry for the best result or tumble dry it on cool or low heat. But be careful not to use fabric softener as it might fade the colors. And never iron or dry clean this shirt to keep it in good condition.