I have been using saline drops and an electric nasal aspirator. It is amazing what comes out of my little ones nose and the relief is obvious on his face đ
another vote for saline and a snot sucker. Use the saline throughout the day to keep the snot moist and then it comes out more easily and they can breathe more.
Have you tried the saline sprays? Snufflebabe is really good too and the snot sucker from Frida!