Juice on keyboard - Acer Aspire 5633WLMi

Question

Hi,

I spilt fresh orange on my keyboard last night, cleaned it up and it seemed to be okay but thismorning I am trying to use it and the underneath of the keys is really sticky. I've looked everywhere for a manual that tells me if and how the keys come off so that I can clean underneath but I can't find anything and don't want to just try taking one off and end up breaking it even more!

SJ