The funny lady took to a public restroom to see if people really do wash hands after using the bathroom for a hilarious PSA for Method about hand washing called "Fight Dirty."
What did Tiff find out? Turns out a lot of people are kinda monsters when it comes to washing their hands.
In the PSA, the 37-year-old spies on unknowing bathroom goers and mocks the ones who opt to skip the post-potty step.
While watching one of the non-washers, she said to the camera, "You go back to the wall with the rest of the nasty men! You did not wash—he did not wash his hands!"
After a few bad apples, Tiffany eventually lathered up to show 'em how it's done.
"Sometimes you’ve got to just lead by example," the actress said.