Oh no! Sorry to hear this! You should be able to easily enough open up the device yourself.
Make sure you place it face down on a clean soft surface to avoid any scratches. When disassembling, keep the clear plastic front cover face down on the working surface otherwise all the buttons will fall out.
When putting it back together be careful with the screws not to cross-thread them or going crazy-tight with them. There is a metal insert in the front plastic cover that can become stripped out if you go nuts!
If for whatever reason you can't clean it out then let us know we can try to help out in some way. Sorry you have to get in there and do the work yourself, but when you do have a careful peak under the battery (the battery connection leads don't like being bent too many times) for some cool artwork!