I used Citristrip and liked it. Of course, it may take several applications and each one (after it works for hours or a whole day) needs to be washed off with water. In my case the stems were rotted and I had removed them, so I could just lift one end of the boat and water would run out the open other end. If you are just doing the interior and don't have the ends taken apart, you may need the canoe on its side or even upside down while you rinse it.