What is a Screen Scrubber?

Can anyone fill me in on what a Screen Scrubber is and what it does to secure web sites?

There’s nothing called a Screen Scrubber, except cleaning products for the screens on your home’s windows.

are you talking something like windows washer? If yes it is a good product

Thanks for the replies. I am unsure of what it is other than it was a suggestion to help secure a web site that takes credit card transactions.