Upload & Sell: Off
Thanks Dave. I know there is an option to get a refund, but before I pursue that, I am going to try cleaning. It is no secret that the 5d has been known to collect a lot of dust, so the kit will come in handy if it ends up working, which I suspect it will.
1) If I had bought the camera, I would be seeking a refund now before a cleaning. Otherwise the seller can claim that the cleaning damaged the sensor. However, if you send it to Canon for (an expensive) cleaning, you are probably in the clear if Canon says they can't remove the parallel lines.
2) The story that the 5D classic "collects a lot of dust" is bogus. It really does not, no more or less than other cameras. The reason it got started is because the 5D was such a breakthrough as the first full-frame camera at as low a price point as it had that it attracted hordes of people to full-frame, many of them much less experienced than other photographers who already owned full-frame cameras.
I have a 5D and a 5D2 and used to have a 20D. In my experience the Classic did not especially collect dust.
3) The 5D classic does not have the ultrasonic sensor cleaner that so many cameras have today, so people with modern crop factor cameras with sensor cleaners who buy a used 5D will think the 5D "collects dust", whereas it just needs occasional proper cleaning as do other cameras without the ultrasonic sensor cleaner, and as do (less frequently) even cameras with ultrasonic cleaning systems.