I adore bright white bedding, but clearly me, DH and DD are sweaty buggers as the pillowcases, sheets around the neck to stomach area and tops of duvets go yellow really fast.
I am washing them at 40C with Lidl biological powder, no fabric softener, sometimes add soda crystals. Usually dry on airers inside next to dehumidifier, esp through the winter, don't have a tumble drier or outside line.
Is there some magic laundry bleach or trick that gets rid of yellow sweat marks?