A small spray of bleach and a once over with this brush and my grout is like a movie star's teeth Used it for washing pots and pans at first, but found an even more useful task, I now use it cleaning grout and fine areas in bathroom and crevices that need it on floors and tub faucet rims

This brush is very high quality

Good for the corners and edges

The bristles are still stiff after a couple years! great brush

The nylon style bristles are stiff and they hold up nicely to lots of use

I believe the orange and white bristles might be manufactured with different strength materials to maximize your scrubbing power