Two analogies that relate actions to the tools used to perform the action is given in the form "A : B. C : ?". "A : B" relates action A to tool B. Your task is to replace the question mark (?) with the appropriate tool for the given action C, following the "A : B" relation.

[EX Q]: cut : glass. scrub : ?
[EX A]: brush

[EX Q]: vacuum : vacuum. wash : ?
[EX A]: soap

[EX Q]: wash : rag. scrub : ?
[EX A]:
brush