Have just discovered flour mites in my cupboard, help! I put two bags of flour in a tupperware box so have been tightly sealed and just looked in the box and its crawling with them! Searched internet and discovered you cant wash them away as they love damp areas. Cant understand how we are so infested as flour has been kept in sealed tub and not in damp area. Any suggestions on how to get rid of them and how to prevent this happening again?