Larry, I started out with wax foundation. It does NOT hold up well in the extractor and over time. I have found that my bees draw out the black plastic foundation that comes waxed in the wood frames faster than the wax foundation. The black plastic frames are a close 2nd. I have been just scraping off buggered up foundation and let the bees rebuild it but perhaps this is what may be a good method for you. I will certainly be giving it a try. It's nothing new. Soak & Save Pressure Washing FoundationAnyone have a jig or gimmick for power washing plastic or wood frames with plastic foundation other than chasing them down on your lawn/driveway with your power washer?