Cleaning chain

I'm trying to find something to clean the chain with. I've got an o-ring and was advised that a metal brush (brass or something) wouldn't be suitable and I'd need a nylon one? I've tried bunnings and super cheap but can't find a nylon one.

Any ideas where I can get one?

I was thinking of using a toothbrush but figured it it was soft enough to be used on my teeth, it wouldn't be hard enough to be used in a chain?

Thanks

Cleaning chain