What's everyone using for a gutter brush?

I’m looking for a good gutter brush and have tried searching here with no luck. Not sure if I need something soft or stiff. So can anyone point me to a good brush?

We use a window cleaning Water Fed Pole by Unger (same one we use for windows) and a relatively cheap window cleaning brush (called the Bro Brush, available in WCR). It has worked great for us.

Thanks dwright. I have been looking at the unger poles. My wife and I bought a mr longarm 24 footer today but full extended it’s very weak. Need to find something a little more rigid.

I have an unger and a reach it. without saying anything awful about one company like I could. We love our unger!