Understatement.
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I had always thought that Mexico was the dirtiest country in the world. I lived there for a couple of years when I was young.
Then my hubby and I lived in the middle east for five years and I thought that Mexico was CLEAN compared to the middle east.
Then we traveled to India for almost a month. I decided that the middle east was clean as a whistle compared to India. Wow.
Then we traveled to China for six weeks. China made India look clean and, to this day, I still KNOW that China is the filthiest place on the planet, bar none.