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Alcohol usually does the trick year after year for us. Just make sure you don't use a colored sponge because it leaves the color on the helmet. Alcohol and some regular soap after a good scrub does the trick every time!
I forgot to add that if the helmets are for a team then what coaches usually do is have each player remove thieir own sticky stuff. My son waits for that day because then he knows his team decal will be coming soon. That is something to be proud of.