How to Remove Tree Sap Stains
Remove as much as possible with a dull knife or a spoon. Rub in a lubricant, like glycerin, and let sit until the sap softens. Place the garment stain-side down on a stack of paper towels and tap to loosen the sap. Rinse. If any stain remains, apply a stick or spray stain remover and let sit for 15 minutes. Machine wash.