How to Clean Mildew Off A Black Hat?

I have a fairly new black outback hat and I see a small patch of mildew developing on the headband of it (the inner rim of the hat). How do I get rid of this? I cannot wash this in the washing machine, because its too delicate for that. Some people have said that I can apply white vinegar on a toothbrush and... show more I have a fairly new black outback hat and I see a small patch of mildew developing on the headband of it (the inner rim of the hat).

How do I get rid of this? I cannot wash this in the washing machine, because its too delicate for that.

Some people have said that I can apply white vinegar on a toothbrush and brush the hat, but won t that bleach the hat out and make it lose its black colour?

What s the best way to clean this mildew off without damaging the hat?
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