I friend of mine, who worked as a TV service man for a couple of decades, was used to clean the TV sets with the high pressure water cleaner (the one meant to wash the cars, i don't know how you call it), and now tath televisions are mostly not serviceable, he changed work, but sometimes manages to repair some PCs.
It still uses its old method, and it works, it's just matter of waiting enough to be sure that anything is dry.
A bit rude, but works.