5. With both the inner and outer bearings removed, dig out all the old grease with a rag or towels. This is the messy step of the job, but required. We used our portable 5-gallon Oil Eater parts cleaner to soak the hubs in after the majority of the gunk was scraped off. The more you clean now the easier the rebuild. Don't be scared to scrub and scrub with an old brush.