I am very sorry to hear of your troubles, but I have some advice that could help, maybe.
I would seriously consider legal action, specifically with regard to" fitness for purpose" and / or "merchantablity". If they don't explicitly advise their customers to re-clean the head cover, they are open to signifcant liability.
Find a lawyer that would agree to a percentage of the settlement as compensation (a good motivator for lawyers to work efficiently) and go after these dolts.
My 2.3˘
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