I picked up a D 44 with factory 4.56 gears for my 69. The housing had sat for a long time with no axels in it. The inner tubes are full of crud and are pretty nasty . The only thing thats not removed at this time is the third member . I have all new parts for the rebuild (chromolly axels, disk brakes new hubs, bearings, etc..) What is the best way to clean the inside of the housing?