We've bought a new bed and I'd like to give the old bed to a charity.
The mattress has a quite a few little marks on it which I'd like to clean off before it goes away, but also the whole mattress has become discoloured. I understand this can be caused by the fabric that sits under the outer cover of the mattress, but it looks dirty.
How can I clean this mattress?
I did see Kim and Aggie doing it once but can't remember what they used.