What to do? Ventilate it each day.. It is better to wait during 5 to 10 minutes (with an open window) before to make the bed. Turn over the mattress at leat 4 times per year, from left to right and the head to toes. The cleaning of a mattress is difficult, so the best option is to protect it and always use a mattress protector. Clean the surface area with a vacuum cleaner if it is possible each two weeks, to warrantie at least part of the mites and acumulated particules leave.