With sun & 80s in Cali you should probably be able to just leave the boat out in the sunshine for an hour or so, then peel them off with your fingernail. I usually use the peeled off decal to dab at any left over adhesive, which will remove 90% of it, if not more. Then there are several adhesive remover products from the likes of Home Depot/Lowes like Goof Off, Goo Gone, etc. Some stink to high heaven & others have that fresh citrus scent ;)
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