Mould is part of the fungus family, and is composed of many cells that branch out and grow new spores. These mould spores thrive in moist, shady areas such as mattresses and pillows. For those with allergies and asthma, sleeping on mouldy pillows can cause allergic reactions or an asthma attack. Regardless of health issues, check pillows for mould regularly, and remove it immediately to prevent health problems from developing.
Check the tag on the pillow to see if it can be washed in a washing machine and dried in a tumble dryer. If the pillow is machine-washable, fill the machine with hot water and add the chlorine bleach along with 125 ml (1/2 cup) of washing powder. Wash the pillow and then put it in the dryer, using the delicate setting.
Soak the pillow in a basin with hot water and 2 ml (1/4 tsp) oxygenated bleach, if the pillow is not washer-safe or white. Let the pillow soak for half an hour, and then squeeze out the water of the pillow and put it in the tumble dryer, using the delicate setting.
Lay the pillow outside on a table or chair to dry in the sun for several hours. The heat from the sun will continue killing any remaining mould on the pillow. Do this even if you washed the pillow in the washing machine or the basin.