scrub (something) out of (something else)
To clean some substance or residue out of the inside of something very thoroughly and vigorously. You'll need to scrub all the burnt food out of the pan with a scouring pad. I've got to scrub this gunk out of my keyboard, or it might stop working altogether.
scrub something out of something
and scrub something Outto clean something out of something by scrubbing. Please scrub the gravy out of the pot. Are you going to scrub out the burned material?