I used peanut butter this summer and it worked great! Just put a glob of peanut butter on the sap and let it sit for about 30 minutes. Then use a butterknife and scrape it off and the sap should come off, too. I had to repeat the process a few times on DS's shorts, but it came right off on the first try on DD's skirt. It may have been the difference in the fabrics. I just washed as normal then and it all came out. Good luck!