scour something for someone or something
to look carefully and thoroughly in something for someone or something. I scoured the entire roster of members for a person who would agree to run for president. The police scoured the entire area for any sign of the suspects.
scour something off (of) something
and scour something offto clean something off something else by scouring. (Of is usually retained before pronouns.) See if you can scour the rust off the cookie sheet. I will scour off the rust with steel wool.
scour something out
to clean something out by scouring. Would you scour the pans out? Please scour out the pans—don't just wash them.
scour something out of something
to clean something out of something by scouring. Did you scour the rust out of the pan? Please scour the burned material out of the bowl.