Here is my recent YouTube upload. I used the AMSOIL Heavy Duty Degreaser to help clean up my differential in my 1989 Porsche 928 S4. The product works very good. Before using the degreaser I used a generic brake cleaning solvent. The brake cleaner worked a little bit but did not brake apart the baked on crud. I would also like to add the AMSOIL Degreaser smell is not that bad. It smells like citrus.