"I'm cleaning my ears because there's too much earwax and I can't hear well."
「耳糞が溜まりすぎて聞こえが悪いので耳掃除中」という日常的な表現を英語にしたら "I'm cleaning my ears because there's too much earwax and I can't hear well." または "I'm removing excess earwax because it's affecting my hearing." などとなります。
ここで、"cleaning my ears" や "removing excess earwax" は「耳掃除中」を表現しています。「耳糞が溜まりすぎて聞こえが悪い」は "there's too much earwax and I can't hear well" や "excess earwax...is affecting my hearing" の部分で表現されています。