Why does hot water clean dishes better than cold?

[Jetboy2]

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Heat kills germs AND dissolves food substances better than cold or moderate temperatures.

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This is partially correct. Enough heat kills germs. Less heat can actually "grow" germs!

"Heat" is relative.

[Lestat]

But isn't a big part of it that heat dissolves better than cold? Germs aside, if you want to rinse off a plate (even before you put it into a dishwasher), you're better off using hot water, rather than cold. That's the only point I was trying to make.