I don't know how clean you can get vegetable by washing and brushing. Yes, you can get a lot of visible dirt rubbed away, but plenty of germs will still be there.
How many angels can dance on the head of a pin?
How many bacteria can fit on the pointy end of a pin? about 150,000.
An ultrasonic vegetable washer can be a lot more effective.
dcarch
Bacteria on a sharp pin
https://mrbarlow.files.wordpress.com/2008/10/bacteria-on-a-pin.jpg