Unger 2-in-1 Corner and Grout Scrubber Brush 979870 - The Home Depot

Uniquely shaped bristles makes cleaning grout and corners fast and easy. V-shaped bristles get deep into grout for a superior clean and a round head allows for easy corner cleaning. Blue bristles scrub.
Uniquely shaped bristles makes cleaning grout and corners fast and easy. V-shaped bristles get deep into grout for a superior clean and a round head allows for easy corner cleaning. Blue bristles scrub tough mildew, grime and soap scum from grout, shower door tracks, bathtubs and more. The handle design provides maximum comfort while allowing you to scrub at any angle for extra scrubbing power.

Unger Professional Swivel Grout & Corner Scrub Brush – Compatible with Threaded Poles, Tough Corners, Grout & Deep Grooves: : Tools & Home Improvement

Efficiently clean hard-to-reach spaces around your home or business with this Libman Small Scrub Brush. The ergonomically shaped handle makes it easy to apply pressure as you scrub without straining your body. It has extra-tough fibers and a specially shaped head that allow it to clean corners with ease. The dual-tone design features rubber grooves for better grip It also has a small hole located in the back of the handle for easy storage when it is not in use.

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Unger 2-in-1 Corner and Grout Scrubber Brush 979870 - The Home Depot