TIFU by not checking the dishes

I was staying with a friend for a couple days, and part of that was making my own food. He made dinner for me two of the nights, but the rest of the time I was on my own, which was fine by me.

I made instant ramen, sticking just to the water, flavoring packet, and a little hot sauce because I didn't want to use up all his food. It tasted really different than it does at home, but I chalked it up to differences in the tap water.

Chores were divided according to a chart and for the first few days I was there, dishes were his sister's responsibility, not ours, so I just rinsed and scraped my pot when I was done and put it in the sink, which was overflowing. You couldn't see the bottom.

On the third day I was there, it was our turn to do dishes. I went to go wash the pot I had used, and then i saw-

God I wish i had thought to take a picture. The bottom of the sink was filled with several inches of dark brown liquid, some mix of coffee and water and food gunk from the dishes being soaked. Drain was clogged i guess? I showed my friend and he went on a rant about his sister, so seems like it was a normal occurrence.

But the worst thing was the cleaning brush. It used to be white. It was DEEPLY stained brown. Like, beyond repair. It clearly just lays in the sludge and soaks it in, and I'm guessing hadn't been replaced in a long time. I tried to post this in r/wellthatsucks but that sub requires an image and when I tried to google "dirty gross dish scrub brush" I genuinely could not find any that were even close to this level of foul.

I feel so gross that I ate like five meals from dishes that have not been genuinely cleaned in god knows how long. Next time I visit i'm only bringing packaged snacks!

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TL;DR: Noticed my ramen at a friend's house tasted off, ignored it and made it several times. On the last day of my stay, saw the sink empty for the first time- it and the scrub brush were completely foul, irreparably disgusting. :(

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(edited to add extra context)