Welcome to the EGGhead Forum - a great place to visit and packed with tips and EGGspert advice! You can also join the conversation and get more information and amazing kamado recipes by following Big Green Egg at:
I have always used a shop vac (plastic version) with no problems at all. Of course I only clean it out every 4-6 cooks or so and always at the beginning of a cook after the Egg has been shut down for at least a couple days, but usually longer....NEVER at the end of one. Not sure who would do that.