And if you know from experience probably, if metal touches metal too much it heats up.

如果您从经验中知道， 如果金属与金属接触过多， 它就会升温。

You don't have metal touching your window, you have this rubber or plastic blade that touches the window and removes the water from it.

你没有金属接触你的窗户，你有这个橡胶或塑料刀片接触窗户并从中去除水。