Scrub out Definition 1 of 3Pro Tip 1/3Physical Effort Refers to cleaning with effort and intensity, often because of stubborn stains or dirt. You'll need to scrub out the grill after that barbeque. Pro Tip 2/3Cleaning Tool Often involves using a tool like a brush or sponge for the scrubbing action. Get a stiff brush to scrub out the tiles in the shower. Pro Tip 3/3Persistence Might require repeated actions; not a quick, easy clean. I've been scrubbing out that stain for hours now.