I use muriatic acid on some things here and there.
It wont damage plastic or most rubber when diluted, and it kicks *** for cleaning rust and corrosion.
But as you have noticed by now, it is something you have to be very careful with.
I sometimes use it for carbs, but diluted and only leave it in for 2-3 minutes.
Then there’s the fumes.
That **** will give you terminal lung issues.