Originally Posted by adrien
once a year. I have very caustic sweat (like it eats through plastic steering wheels...i had a car where i had to replace the wheel 3 times!), and it aint worth it.
You might want to stop chugging the bleach and battery acid cocktail!
To me, if you don't throw it around and don't leave it in your car, it should last a few years. I don't think hard polystyrene will be as easily degraded as the crappy plastic they use on steering wheels, so I wouldn't worry about the sweat. And if you get enough UV exposure in a year while actually wearing the helmet to degrade the polystyrene, I'd be more worried about skin cancer!
Still, you should get that acid sweat thing looked at.