A: Yes I bought it to clean light mold of off tile and it works great.
A: Yes, you can scrub walls with this.
A: This has flexible bristles for heavy duty cleaning. Always try it on a small area to be sure. It really depends on what your walls are made of and what is on them. Thank you, Dawna
A: Yes. Works great for hard to reach spots on shower walls
A: The dimensions for the Long Handle Scrub Brush (item #10) - 17.63 x 3.25 x 3.13
A: Total length of brush is 16".
A: 8 to 12" not sure I did not measure it.