Don't know what possessed him to do this, luckily I caught him in the act and even more fortunate the computer was off. The BD drive and card reader took the brunt of it but some liquid did get in. There were spots on top of the power supply but doesn't look like any could have got in. There was also some liquid on top off the graphics card on the back of the circuit board. I'm going to junk the card reader, as it was only £7 I'm not going to risk putting it back in. I've stripped out all the other parts to dry off. What are chances my GPU is still functional? Anything else I can do? I'm going to wait until this afternoon before putting back together, fingers crossed I guess.