Can't help you with getting the inside of the helmet clean but I can suggest a way to keep the problem from recurring. I wear a balaclava in cold weather and a satin skull cap the rest of the tiem. When one of them gets funky, just toss it in the laundry.
There are several options concerning helmet cleaning. I personally recommend using rubbing alcohol to do a cleansing then apply some type of deoderant (fabreeze). They do make a helmet spray that is sold at dealerships to make them smell better. But nothing beats paying a little extra for a helmet that has a removable lining that can be washed. :idea:
I've seen stuff advertised somewhere (can't remember where or when) that you spray on the liner and let dry. Personally, unless its a reallly high dollar hat, I'd just swish some mild detergent, or a little bit of dishwashing det, with warm water and rinse well. Might take a while to dry; just sit it out in the TX sun.
Most helmet liners are just foam with a padded liner. Not much to harm.
Matter of fact, my old one...which I still prefer over the new one..is also sort of funky. I'll go give it a sood swish and let you know the results in a day or so when it drys.
Took my helmet outdoors yesterday, filled it with warm water mixed with a little Woolite soap, swished it around with my hand, rinsed thoroughtly with water hose, sat it on top of the outside air conditioner to dry, and a few hours later I had a nice clean smelling helmet again.
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