Removing adhesive-backed stripes and lettering...
Easy Off only works on paint. To remove anything that's glued on, warm it with a blow dryer...be careful, you only want to soften the adhesive, not melt the plastic! Do just a foot or two at a time. After you've gotten all the striping or lettering off, spray the area generously with good ol' WD-40 (which works better than most products specifically marketed as "adhesive removers"...and you already have at least 3 cans of it, so why spend money on something else that you're only gonna use 10% of at most?) and let it stand for several minutes. Use a plastic scrubber pad to remove all the (now softened and loose) adhesive residue...wash the entire area thoroughly with detergent and water to remove the oily residue of the WD-40.As with anything painted on, anything that's been glued on the hull for any length of time will prob'ly leave a "ghost" of itself because the gelcoat around it has oxidized and the gelcoat under it hasn't. You can put a lot of effort into wet sanding, compounding and polishing...or you can do it the easy way--although it does take a while to work: spray the area liberally with undiluted bleach...every day if possible...if not, as often as you can. Don't rinse it off...let it dry on the hull. The combination of bleach and sun will fade the "ghost" to the same color as the hull in a few weeks.