Gray Water Tank Crud May 08, 2014, 08:19:46 pm Yahoo Message Number: 146154What solutions and methods work to get rid of the soap residue and grease in the grey tanks so that the sensors work "reasonably well" ... I had thought of a good degreaser or liquid plumber in a half full tank and drive around and keep doing it until the crud is gone. We have a 2010 MB and using the cameo back flush unit does not do it. Thanks for your comments and recomendations, PS black works fine. Dean Ansley 2010 MB Currently at Crystal Cove State Park