Is everything in the hotel clean? What can't be used?

It shouldn't be very clean. One year, some of our friends went out to play and stayed in a hotel, which was famous and the location was not bad, so we chose to stay.

However, after we came back from playing at night, I wanted to eat something, and I wanted to eat instant noodles on impulse, so I went downstairs and bought several bags of instant noodles. When I was about to use the hot water kettle put in the hotel to boil some hot water, my friend came out of the toilet in vain and saw my mouth open wide when I was using the hot water kettle. Later, I was anxious to remind me not to use the hot water kettle in the hotel, because someone staying in the hotel would use this hot water kettle to cook underwear. It is said that it is used for disinfection ... well, I almost didn't throw up. Whether it's true or not, I'll try not to use it anyway, because none of us know whether someone did it, just in case.

And those disposable toothbrushes, not that they are not clean, but that I think I should bring a set or one I usually use, because things in hotels are generally much more expensive than those outside, and we are all students. If we can save a little, we still think we should be frugal.