For your deep cleanse, soak your metal pipe in isopropyl rubbing Liquor. That should dislodge any stubborn residue without difficulty. You may also run very hot water in the pipe that can help preserve factors clean up.virtuemart_product_id,virtuemart_shoppergroup_id,product_price_publish_up,product_price_publish_downvirtuemart_product_id,virtuemar