I'm not a oil burner tech by any stretch of the imagination. This is why I got rid of the old oil furnace and hot water tank in the house I just purchased. Allready had natural gas pulled and have installed the variable speed, modulating furnace and the instantaneous hot water heater. Now I'm left with my, empty, oil tank. Local recycler will only take it if it's been cut in half and cleaned. How do you clean an oil tank, any special poducts, any advice would be appreciated.