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Elbow grease mate...it's the only way. I use steel wool and a bit of wash-up detergent (neat) although no need to be too particular about the part where the sawdust burns. A good trick is to use a bit of that spray on oven cleaner on the grill/bars and that makes it real easy work, although make sure you hose it off well. Oh yeh, if you're at the beach a hand full of sand works wonders as well.
You could try spraying the inside walls & grill with a spray on cooking oil first to create a barrier , should make it easier to clean , !
happy Smokin Fozz