Citristrip works okay.

http://www.wmbarr.com/MSDSZipFiles/Citristrip-Sep-09-2012_09-18-50.zip

This page lists a few more. I haven't tried them. Safer Paint Strippers | Furniture | This Old House - 1

• 1-pound household lye
• 2-4 boxes of common cornstarch
• 2 gallons of warm water

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'99 E300 Turbodiesel, '82 300TD, 1996 12V Cummins Turbo, '94 Neoplan - Detroit 6V92TA