He has nothing to lose by trying -- they're ruined anyway, and you
don't want the smell of sour milk on top of it.

Milk isn't good for dogs anyway, and even worse for the TV.

Art wrote:
Probably not, but if you want, disassemble the screen assemblies and attempt
washing the materials off the affected areas, however you will probably just
cause more damage.

Screen Protector is screen nearest to you, clear cover for the other two
screens.Should be able to clean both surfaces, fingerprints can be a
problem.
The Fresnal is the back screen, nearest the mirror, between them is the
Lenticular, having lines that run up and down.The Fesnal may be cleaned f
necessary, can be a time consuming process.
The Lenticular is the most fragile because it is very thin and easily
cracked or broken. Also the ridges have normally a black substance between
them that is water soluable, meaning when you attempt washing off the
spilled liquid you will possibly also wash off the coating on the screen.
This effectively will ruin the Lenticular Screen. Good Luck.