Best ways to get rid of mustiness in big divan and mattress

[Rollermum]

We rent our flat and during colder months have issues with mould. I have worked hard to get of it with dehumidifier, heating, opening windows etc. I also treated the walls and it hasn't returned (yet).

However, there is a slight lingering smell which I think is due to the kingsize bed - either mattress, the base or headboard, I can't tell. I want to deal with this mustiness, which is quite slight, because it is annoying. Also, more importantly, I am expecting DC2 and will probably co sleep again and want to ensure it is as safe and clean as possible.

Any recommendations. I have heard you can steam clean a mattress - but how?! It is a massive beast, really thick! I'm up for hiring a steam cleaning machine if needed.

[Llareggub]

I have no idea but I also have a musty mattress...

[Rollermum]

Actually I just did some googling and found some videos on youtube. Some suggest extra moisture on a mattress is a bad idea, so I might try this first:

[Pinkcloud6]

Spay with Zoflora on a very hot day and put it outside.

[WingsClipped]

Bicarb sprinkled all over. Leave for a couple of hours. Vacuum it away thoroughly. Should take away the musty smell.

[chocolatespiders]

Add drops of lavender to some bicarb and sprinkle over the mattress, leave as long as possible and then hoover. It also kills the bed bugs

[Rollermum]

Thanks all! Glad there are some steam alternatives.