I recommend Motrin & a heating pad
I just did my Oday 22 (when not fertilizing, cleaning out flower beds, etc etc) and found that a wallpaper scraper worked the best in my case. Prior to that I experimented using a house scraper and putty knife which were somewhat effective but way too much elbow grease involved. With the wallpaper scraper the paint chipped right off in long strokes. I then followed up by orbital sanding with 80 grit.If using a wallpaper scraper I'd recommend firm but easy pressure, otherwise aggresive scraping could gouge the gelcoat. After wiping down with alcohol or acetone I'll be applying Interlux Bottomkote ACT ablative. I'm not doing the Interlux Interprotect as mentioned earlier since my 22 is mainly trailered. Otherwise I think it makes good sense in order to avoid osmotic blistering.