I know some of you are chemists and engineers, and hope you can help. Short form question: how do you remove spray adhesive residue from plastic?

I have a have a roof top kayak rack with some plastic bits that make contact with the boat's fiberglass hull and leave marks. So I used some Loctite Spray Adhesive to glue some closed cell foam pads to those plastic bits. I learned this week that the glue doesn't like blistering heat and sunlight and now the foam is peeling off, leaving behind the adhesive residue. As such I want to remove the residue and try another solution.

The Loctite website mentions everything from cooking oil, to vodka to using a heat gun and scraper. I want to get the residue off efficiently and without damaging the plastic bits on the rack. Any thoughts/experience in this area?

Also, now that I know Loctite is not a solution, what other adhesive should I try for round two? It has to be something that can withstand being outside, on the roof of a car.

Thank you.