I would recommend you fire up your most demanding game and put all setting on max to put a lot of heat into your component's which under normal circumstances is not a good idea.
Feed some cookies to your computer. Well, in reality carefully clean milk drops inside computer with isopropyl (cotton buds may help here), dry it off and pray that computer will work in future.
Main problem with forgotten milk in computer and other tech is stench after some time. Which can become quite unbearable in some conditions.