OK, I know the obvious answer is "turn it on and sterilise it..." but just wondering if there's something else I should do. I haven't expressed for a week or so and stupidly didn't wipe it out last time I used it (it's the Tommee Tippee steam one). The damp has made a few black mould spots grow. I've wiped it with a cloth and they've all come off, but should I clean it with something before using it again?