Using state-of-the-art, high-powered industrial vacuums, we can remove built-up dust, rubbish and potentially harmful lead particles from your ceiling cavity. Lead poisoning occurs when lead is ingested. Lead particularly can be more harmful to young children as they will absorb about 50 percent of lead ingested - it can also be caused by breathing in dust that contains lead. You cannot smell or taste lead. It is not visible to the naked eye.