If the cleaners are non Muslims and using wet clothes to clean the floor of the room then make sure if you step up with your wet feet then it would become najis so in that case use indoor slippers.
For bedsheets if it was washed by non Muslims then you can’t use as long as either bedsheet is wet or your body so in case of use itself bedsheets and your body should be dry.
For Laundry washed clothes if you are 100% sure that it was touched by non Muslims then it would be considered najis otherwise it is Pak.
Sun can’t make any movable things it can only make Pak non movable things like buildings, earth and wall etc. So it can’t make your food stuff and bedsheets or clothes unless you have washed them.
In short the best solution to deal this issue
Keep one or two pairs of clothes separate for your prayers and if you are praying on ground use Musalla. As for as food concern you write a letter to the office of Ayatullah Khamenei (May Allah protect him) on this link www.khamenei.ir and ask special permission for food stuff.