A scrubber is a tool or a person that cleans something by rubbing it hard.
A scrubber can make people think of cleaning, hard work, and making things very clean.
Examples:
I use a scrubber to clean the dishes.
The scrubber is good for cleaning the floor.
She is a good scrubber and cleans everything very well.
The scrubber is working hard to clean the floor.
The magical scrubber cleaned the whole house in just one minute!
I am the best scrubber in the world and can clean anything.