The best disinfectant is UV light from the sun. The more you expose your body to the direct sun light the more disinfected you will become. The beach is full of it (sun) , the more intense the sun light the greater/faster the disinfection. Most virus's are destroyed quickly by UV exposure to UV light. ( the sun has just about all wave length's of UV light, making sun light one of the best and effective ways to destroy bacteria and virous.
