Cold season is the worst

My poor baby boy has been sick with a cold on and off for over a month now. He is on his 2nd ear infection now and has pink eye. He is in daycare so I expected some colds but not one that never goes away! Every time he feels better for a few days, the weekend comes and he’s sick all over again... I am constantly washing bedding and disinfecting everything. Anyone have any suggestions on how to keep the germs away or rid my household of cold season even if it’s just a few weeks?!