I forgot a very important part of my previous post!

I forgot to say that after lifting the keys from the fabric after it has been steamed, it needs to be rinsed in salt water to neutralise the vinegar.  It would be wise to wear rubber gloves during this bit as the keys are black and need washing too.  When dry they will still be rusty and can be used again, as can any rusty metal bits you may have.

I think that is everything this time!