These 18 inch scrub pads are used for medium soiled floors. They are used exclusively on our Viper Fang 18C floor scrubber and our IPC Eagle 36" rider scrubber. When using a blue pad, we recommend using one of our floor cleaning degreasers to removing those real heavy soils. Take a look at our complete line of floor scrubbing pads for other scrubbing options. Take a look at our auto floor scrubbing procedure for the most efficient way to clean your floors with an auto scrubber.