Perhaps you evenuse a humidifier every day.
Of course, if indoor humidity runs too high, you’ll have other issues.
If you have one, do you remember the last time you cleaned it?

“The key, whatever the throw in, is to clean and maintain it regularly.
Each day, you should empty and rinse the tank even if you’re not doing a complete cleaning.
After that, thoroughly rinse out the tank.

Finally, check and clean or replace filters regularly, according to the manufacturer’s instructions.