Hello! What material is your thermal underwear? What exactly is the stain on the clothes? How long has it been polluted? Please check the washing label carefully before cleaning. If it can't be washed, it is recommended to send it to a professional dry cleaner for dry cleaning. If you can wash with water, you can try the following methods:

1. After the clothes are dried, smear the original liquid of blue moon hand-washing special laundry detergent on the stain, completely cover the stain, let it stand for 5 minutes (gently scrub), and then add blue moon laundry detergent for routine washing;

2. If the above methods can't remove the stain, put the clothes into the basin, stick the stain on the bottom of the basin, and measure out the stain of 1/4 bottle cap (10g) colored clothes and 1/4 bottle cap (10g) blue moon collar with the stain of blue moonlight clothes. If the stain is still not removed after 2 hours, the standing time can be extended to overnight.

Note: The color stains on colored clothes are not suitable for faded clothes and dry cleaning clothes. Avoid touching metal buttons, zippers, metal ornaments, etc. Avoid direct sunlight on clothes.