Mildew on cabin wall

Hi all,
just wondering if anyone knows a method of removing mildew from a cabin wall. The surface is unfinished fiber glass. I was going to just paint over it but i want to make sure the mildew dosnt find its way through again.

Cheers.

1 cup hot water
1/2 cup hydrogen peroxide
1/2 cup baking soda

mix it up and paint it over the mildewed spots, leave it to soak in overnight, next day wash it off with a sponge dipped in clear water with some domestos added. Job done. Let it dry off completely before painting over it.

Super, thanks for that Austrian!

I find detol mould and mildew brilliant,be cafetfull as there is bleach in it,but works better than most expensive products,in a green bottle,eddie..,,