Fun video ..laughed at the start and introduction 😅. Thanks for all your hard work Minami ..great job 😍. I would use an antibacterial spray (possibly regularly in the hot Japanese summer). Motul M2 Helmet Interior Clean keeps my helmet fresher for a lot longer. I know Arai recommends cleaning regularly (every 3 months or so). Also ..once back from touring in the rain / hot summer heat..leave it to dry (visor up) overnight ..don't put it in the rear box 😊. Think your detergent and water technique should be fine ..don't every dry on a radiator or heater though ..could damage the interior 😢. Have a wonderful week..take care ..stay safe from any approaching typhoon ..❤