If your helmet is bogging then what's wrong with the usual detergent and loads of rinsing, then put outside on a sunny day to dry it off.
If it's not too bad I spray the inside with those antibacterial sprays from the supermarket - you can use this on the inside of gloves and boots too. Cheap as chips.
After a couple of doses of this stuff, my next cleaning will be the full wet wash with normal detergents. Not washing up liquid, as this leaves an invisible film which crap sticks to. It's also full of salts; incidentally all shampoos are full of salt too, so you dont want to use them. I used to use shampoo or washing up liquid on the bike (as it was handy) but now I've stopped that.
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