> However, the screen has been badly affected - it has big glare artifacts 
> across more than a quarter of its area, although all the pixels seem to be 
> firing OK so maybe the moisture is in a different layer or something.

Yes, it's pretty unlikely that any moisture got inside the actual LC, or 
even under the polarisers, they are all laminated together with 
moisture-proof seals around the outside.

What probably happened is the beer got between the rear polariser and the 
backlight, there is usually a 100-500 micron air-gap that could easily fill 
with liquid.  Any contamination in this area will show up very obviously on 
the screen.

Cleaning it out will be hard, if you're lucky you could remove the actual 
display panel from the backlight without too much effort (sometimes they are 
stuck down with almost super-glue like adhesives!).  But then the backlight 
will consist of several very thin optical films, which the liquid could have 
got between too.  In theory you could take the backlight apart and clean 
each film thoroughly, but I don't rate your chances of being able to get 
back to a perfect looking screen (this sort of assembly is normally done in 
clean rooms).

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