good day ,
if I had such an item, then I would wash it gently in a bucket with kerosene, wiping it slightly just with a dishwashing sponge, then after drying, I would apply WD-40 abundantly, and then dry it with a hairdryer. and later the second layer WD ..
it will not damage the helmet in any way, but it will give good protection in microcracks and chips. probably nothing more needs to be done, the subject is very nice ..
with respect
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