Most here would agree that Red Line Diesel Additive is the best and only one that works. Dump a whole bottle in the tank to clean then an ounce or two at each fill-up for maintainance. Also, when you change the fuel filter that looks like an oil filter, fill it up with the Red Line before you screw it back on and that will really give it a super cleaning. I think Red Line now refers to it as #85, it's available at Pep Boys.

Also, for once or twice a year cleaning, Diesel Purge is great too.

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Mr. BILL

91 300E 120K
90 300SE 275K (sold)
92 BMW 525iM 120K
90 BMW 525iA 175K
85 300D 175K (sold)
84 300SD 245K (sold)