Sink for pesach

Do I need to kasher a stainless steel sink for pesach if I have poured the boiling water from cooking pasta directly into it?

No just make sure it’s clean

Hi Rabbi. Does this apply to all kitchen sink types? In other words, the way to prepare is to clean out the sink - but no need for other steps (like 24 hour wait or kashering, or pouring chemicals down drain)? Thank you.

Yes

Hi Rabbi. Similarly, with respect to a soap dispenser that sits year-round on counter very near kitchen sink: can the dispenser be cleaned and then used for Pesach?

Yes