Noisy air compressor

[Ricky]

So I have an 08 prostar with a Cummins. I know that the air compressors are noisy. But some times it rattles so bad it makes me worry. Other times it's pretty quiet for an ISX. It was changed about 2 1/2 years ago and I don't run a lot of miles. I do the gear oil, by pass filter and short oil changes. It still has all the factory stuff in place but I do the tune ups like I should. So, has anyone had any success running anything through the air compressor to clean it out. I know I would have to remove the out line as not to get stuff in the air system. But sometimes it is like really bad out of adjusted valves, the rattle. I was told it is from the carbon build up, any ideas.