Blue pads are great for wet scrubbing or heavy-duty spray cleaning because they aggressively remove heavy dirt and scuff marks. Use these sturdy pads with machines up to 350 RPM. Blue Scrubbing Pads Low Speed – This pad is designed for wet scrubbing or medium-duty spray cleaning. Removes heavy dirt and scuffmarks on most floor surfaces. This pad will remove the top layer of floor finish. Use at 175-350 RPM.