What must be done to all surfaces before conducting clearance testing?

Thorough cleaning and dusting of all surfaces is essential prior to conducting clearance testing to ensure accurate results. This process removes any dust, debris, or contaminants that could interfere with the test measurements for lead-based hazards. If surfaces are not properly cleaned, residual lead dust or particles could cause false positives, leading to incorrect conclusions about the presence of lead.

Effective cleaning involves using damp cloths or specific cleaning techniques that can capture and contain lead particles, ensuring that the surfaces are as free from debris as possible before testing. This step is crucial as it not only impacts the integrity of the clearance testing results but also ensures compliance with regulatory requirements aimed at protecting health and safety. Proper cleaning is a foundational element of the clearance process, validating that any lead-based materials have been addressed adequately before confirming lead clearance.