Originally Posted by: PRSplayaA soft bristle tooth brush can be good at getting that caked on grime off of the board, and from around the frets.

I tried tooth brushes.. I found them to be too soft. I enquired at the music shop what their luthier uses, and after being shown what the proper brush is, I went and bought a grout cleaning brush instead. It uses the same type of nylon bristles that a professional fret cleaning brush uses and is half the price.. plus the handle is more comfortable. :)