Outside grease
One of the reasons to clean your barbeque before you move home is that there will be grease on the outside. Unless you wrap it in something, that grease could get on other things in the moving truck. Even if you do cover it with something, you are going to get grease on the thing that is covering it. There is even a risk of the grease getting on the inside of the moving truck. Although this may not affect you, it is still bad manners to dirty other people's property. The grease that gets on the inside of the moving truck could even get on another customer's belongings.
Inside grease and residue
With use, a barbeque will have a build up of grease and other residue under the grill. Although there will be a mechanism for getting rid of the grease, you will never naturally get rid of all of it. To get rid of all of the grease, you will have to clean out the inside of the barbeque. If you didn't do this and some of the grease were to leak in transit, it could cause a considerable mess. As discussed above, you could cause issues for yourself, the moving company and maybe even another customer.
It needs to be cleaned at some point anyway
At some point, you will need to clean your barbeque anyway, so you might as well clean it to ready it for transport. There are various reasons that your barbeque needs to be cleaned. If you don't clean the grill of the barbeque, you will start to get residue from previous uses on your food. Not only can this ruin both the taste and your appetite, it can also be very unhygienic. The second reason that you need to clean it is for safety reasons. If you let grease, fat and other residue build up too much, there is a chance that it could catch fire and cause issues. You don't want anything in your barbeque to catch fire without you doing it intentionally.
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