DH and I have a large futon mattress which he likes to sleep on on the floor when he has a bad back.
I have had it down for a week for a guest, with a sheet between the bottom of the mattress and the floor, for a week. It was fine when I put it down.
I have just gone to wash the covers and sheets and put it away and have discovered that it has mould on the underside of the inner cover, and quite a lot of it. This cover won´t come off. I don´t know how it happened (it´s not wee) but is there anything I can do about it, or does the mattress just have to go?
Our had buttons on it that stopped us removing the cover, I discovered that you can remove the buttons and think you can get them back on after washing the cover but I've never bothered to. We don't have ours on a futon - just rolled up for if we ever need it so it doesn't matter that the buttons are missing!
It'll be the moisture off the body I'd say. Do you just have the futon or the frame as well, the frame will keep it off the floor and allow the airflow under it. What to do now though. Would it come off with soapy water and scrubbing brush.
Don't use bleach. You can get the cover off but it's very difficult to get the cover back on. Use a damp cloth to wipe away the mildew, let it dry, then spray with white vinegar. It might take more than one attempt. Do the top and bottom and sides of the mattress. Once it is clean and dry, pop the whole mattress in a mattress cover or spare duvet cover. Use a futon frame if you can. If you haven't got a frame, they frequently come up on freecycling sites. As do mattresses, often in immaculate condition.