How to Use Grape Seed Extract to Clean Fungus. Part of the series: Alternative Medicine. Grape seed extract is an invaluable tool to have when it comes to cleaning fungus. Find out how to use grape seed extract to clean fungus with help from a Ph.D in Natural Health in this free video clip. Read more: https://www.ehow.com/video_12216548_use-grape-seed-extract-clean-fungus.html