Today I cleaned a two oven AGA which wasn't too bad of a job. It was a repeat customer so we have cleaned this AGA about four times before and as it was in Bristol it was a short drive from the office. In all if AGA owners get their AGAs cleaned regularly the job is easier as level of dirt isn't as great as say someone who has owned an AGA for 30 years and has never had it professionally cleaned. The end result was a very sparkling clean AGA.
Before and after photos attached (which appear to be in the wrong order).