Sterilising bottles etc, do you rewash before resterilising if they haven't been used?

[WalrusGumboot]

So I've left it more than 24 hours and not used them so they're no longer sterile. Do I have to wash again or can I just pop some new water in and microwave again?

I just resterilise. The point of washing is to remove milk fat/taxes and dirt, because sterilizing won't do that. If they were washed 24 hours ago and you've had them covered since then they shouldn't need another wash

Fabulous, thanks Hugh.