Outer Limits 4x4 Board

So i am about to clean a dirty old diff centre up to fit and i was just wondering what methods and products people use to go about this???

p.s i dont have a parts cleaner sink.. i wish

cheers
matt

Bucket half full of petrol and gloves

A mix of petrol and some truck wash is good. Let it sit over night in it then hit it with a non metal hard brush and some elbow grease.