How do you remove pine sap from a cotton t-shirt?
Tree sap is a very challenging stain to get out. Try treating the stain directly with DeSolvIt® or Goo Gone®, which you can find at hardware stores. You should first test for colorfastness (apply a drop to a hidden part of the garments, rinse, and blot dry) if you want to be sure the product is safe for the fabric. If there is no color change, rub a little into the sap and then wash with detergent in the hottest water allowed (check the care label). Allow to air dry and then check for success. You may need to repeat the treatment to remove the stain fully, so it’s very important to keep the item out of a hot dryer to avoid heat-setting any residual stain that would otherwise come out with a second treatment. You can also increase the length of time you pre-treat the stains before washing—just don’t let the product dry on the fabric.