You can unscrew the elements of the lens pretty easily to get at any dust. My lens is in excellent shape, and I have to say, I love shooting with it. I bought a whole K camera that someone had listed in war memorabilia for about $75. To attach it to the Speed, I made a lensboard that fit just over the brass threads, and I secured the lens to the board using two 3" rubber gaskets from Home Depot (Toilet bowl parts). Works like a charm for $15. Focus is, of course, GG only.
The combo, with SG and a polaroid back is really fun. Here are a few shots.