Why do they make these travel mug lids so hard to clean? The rubber seal doesn't even come out.

How to say “Why do they make these travel mug lids so hard to clean? The rubber seal doesn't even come out.” in Japanese

In Japanese

なんでタンブラーのふたって、こんなに掃除(そうじ)しにくいんだろう。パッキンも外(はず)れないし。

Nande tanburā no futa tte, konna ni sōji shinikui n darō. Pakkin mo hazurenai shi.

Why do they make these travel mug lids so hard to clean? The rubber seal doesn't even come out. in other languages