My 3 years old is down with phlegmy cough. Any remedy to clear the phlegm?

Please visit the doctor just to get him checked. Theres so many viruses going around. You can also use Sterimar nasal spray,gently pat his back to loose the mucus and also do a steam room effect in your toilet and bring your child in to inhale it. Read about this steam room effect somewhere and it has helped for my LO