Once I had removed the old KeelEazy strip from my kayak, I was left with a sticky residue from its mastic. Instructions on the web said the residue could be removed with isopropyl alcohol a.k.a. rubbing alcohol. I tried it. It didn't work. Not at all. So I tried using a product called Goo Gone. It worked. It did the job easily. This product is great for removing a sticky residue from anything. Everyone should have a spray bottle in their house. This video shows how it works.
[Please excuse the misspelling of isopropyl in the video's introduction. I didn't catch it till after the video was uploaded.]