回答
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Glasses get fogged up when you enter a hot room after being out in the cold.
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When you enter a hot room after being outside in the cold, your glasses fog up.
Fog up は窓グラスやレンズが曇ってくるときにつかわれます。
The windows of the train fog up in winter.
Cloudy もグラスやレンズについて話に使えますけど、それは湯気じゃなくて、擦り傷あとです。
My wine glasses got cloudy after I put them in the dishwasher.