Tree Skirt

The tree is a blue spruce pine. Some of the sap on the skirt but I have my grandmother's beautiful tree. Ideas?

Pitch pine tar and dissolve in solid solutions Alkalai, ammonia, soda ash, caustic soda, or even oven cleaner, but you'd better test the fabric first. Try to put the skirt in the freezer in the field can become so fragile that being reduced to dust and dried.