What method is recommended for cleaning hard-to-reach areas like under sill plates?

Low-pressure flushing is recommended for cleaning hard-to-reach areas like under sill plates because it provides a gentle yet effective approach to remove contaminants without damaging structural components. High-pressure washing may displace materials or lead to water intrusion, while scrubbing with chemicals might be impractical in confined spaces and can sometimes leave behind residues. Steam cleaning, while effective in some scenarios, might not deliver the targeted application necessary in tight areas where moisture retention could be a concern. Low-pressure flushing allows for controlled application, ensuring that the area is effectively cleaned while minimizing the risk to the structure.