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I used some liquid stuff from drycleaning you mix with hot water, it's removing oil product for work clothings, I took my pipings out and put them over night.. next day all the oil and dirty stuff came off nice..
after 2 hrs of sanding
i used 430 (dry) to get rid of all the dirt, grease ...
than to finish it up .. i used 600 (wet) with a lil bit water... and to remove the fine scratches i used 900 (wet) with water as well