Stink free helmet

I use my bike regularly to go to clasess and those rides are often very small about 20-30mins rides but very sweaty rides so my helmet's padding often starts to stink,i try to wash it every week but have noticed that smell of sweat comes back with in a day or two of use.I dont give my helmet to anyone for use to avoid the“dont u wash ur helmet?”talk and to avoid getting head fungus.However i have seen one of my friends helmet which he says he hasnt washed for months doesnt stink ,so im wondering is it my head problem or my helmet(mt stinger shell) or both via /r/motorcycles https://www.reddit.com/r/motorcycles/comments/dcnzrg/stink_free_helmet/?utm_source=ifttt