I have a bunch of plain white bras for everyday wear that I hand wash, they're my favourite bras because they fit so well. I was soaking them in a bucket and I have no idea how or why but a bunch of small black speckled marks appeared on all of them, it almost resembles black mould 😔. It's so weird, I was washing them in the bathroom and haven't had anything unusual in there, and I live alone! My only thought is that the water board have been working on something a few houses up and some debris came through, which would be scary if true because it's the drinking water supply. I've tried using oxygen bleach on them and it's lightened the marks but they're still there.
My last thought before binning them is to soak them in a bit of household bleach. If I go ahead how much should I use and for how long?
Will this just ruin the bras? And is it dangerous to mix it with oxygen bleach (obviously I've rinsed that off but there probably is some residue).
Thanks for any help.