I use WD-40 Spray in on copiously then use a toothbrish to loosen any grease, then wipe it off. Repeat as necessary. No water necessary. Great results, no paint damage.

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body. '87 300D w/ Sportline suspension. No more '79 300TD w/ 617.952 engine at 367,750, it was my annual driver to Texas and I sure don't miss it poor A/C heater system!