baby duck lost peep, snotty

[Niss]

A pekin hatched by one of my hens earlier this week got left behind today. When I found it, the duckling let me pick it up. No peeps! On closer inspection it was blowing saliva bubbles and had a clogged nose. I took it to the waterer--tried to clean it up and let it dunk and swish it's head. Still no peep.
What do you recommend?

Edit to add weather turned cooler and wet the other day.

 

[Niss]

It died a few hours later.