I once lived in an apartment where the bathtub drain was pretty plugged. It would drain but every shower was done in a slowly rising puddle. I tried draino but it didn’t make a difference.

I eventually had a roommate move in and noticed right away that the tub drained better, asked him how he fixed it. He used the plunger. It blew my mind because up until that moment, I had thought a plunger was specifically for use with toilets.

Now I have a toilet plunger plus a smaller sink plunger since the size of the standard one can be awkward to use on a sink, plus the whole not wanting to use something that’s been in the toilet on things outside of the toilet.

Not that I’ve even had a plugged toilet in years, and, having a bidet, it’s even less likely going forward.