Liquid Damage to my Eris!

Yesterday, at work, I accidentally dropped my Eris in chocolate frosty mix (icecream). I immediately took it out and dried it off and it was still working. I am now realizing today though, that it will not keep a charge. I have it plugged in with my ac charger and it works. But as soon as I remove the charger, it shows the lowest low-battery screen. I cannot turn the power on unless it is plugged in. Even while plugged in, it's turned off for no apparent reason, twice.
Please, somebody help me!!! I just bought this phone a month ago, new from eBay. So I have no warranty or insurance on it. :(