wee stains on mattress - how to get rid?

[shouldbedoingthehousework]

I'm just about to move ds into a full size bed and am passing his junior bed on to some friends, however the matress (which is good quality) is quite stained and looks awful . Does anyone know the best way to try to clean it up a bit (it doesn't smell or anything) Can't really understand how it's got that bad cos we've always had a plastic sheet on and ds still wears pull-ups to bed anyway

[shouldbedoingthehousework]

..I'm assuming it's wee stains btw - it's quite yellow...maybe sweat? Surely lo's (he's only 3) don't sweat that much anyway do they?

[Laura032004]

You can get terrible sweat stains. Speak from experience of a few years living in Cyprus. The matresses were ruined. Did he have drinks in bed? Strange with a plastic sheet on though.

[shouldbedoingthehousework]

He doesn't drink in bed, but can get quite hot at times so maybe it is sweat...I'm hoping it's not ruined (stains are in smallest area..) as I've promised it to a friend now