peroxide
First, you should remove the dust from the mattress, first by vacuuming and then using a semi-damp cloth. In case of stains, it will be enough to use a solution based on water and baking soda, which will be sprayed on the stain and then rubbed with a sponge.
woman sleeps between clean sheets
Then, in a bowl, mix the white vinegar and hydrogen peroxide, and once moistened, rub a clean cloth over the mattress until you see the yellowish stains dissolve. After the treatment, it is best to ventilate the room , this way the mattress will dry faster.