Hey DK,

My method is to dig out a small amount of Dingowax and ply it in my fingers until its soft then i apply a bit to a tough rag and work it into the fret board. Sometimes I wrap the rag around an eraser when i work it into the fretboard.
I keep plying the main bit of Dingowax in my fingers to keep it malleable or sometimes I put it under my cup of coffee to keep it warm.