Didn't you read or believe any of the links and information I gave you on the X-66 Thread?
I put a lot of time into trying to give you all of the options I knew of...
Simple answer, Lubro-Moly Diesel Purge:
Or Lubro-Moly Proline:
Have you had a mechanic tell you that you need to decarbonize your engine, or do you have symptoms that indicate that decarbonizing is in order?
If you're not already using Redline DFC/85+, I would do the full bottle clean-up and start using it. My '82 300SD has been fed this stuff for 10 years, and runs great with no smoke, and great performance...
You can get all of this stuff from PartsShop...