What is the opinion of Reddit about the
AC Safe Tablets-30 Count: Cleans scum in Drain Pans and Humidifiers, Blue?

Keeping something like this in the tank helps.

AC Safe Tablets-30 Count: Cleans scum in Drain Pans and Humidifiers, Blue https://www.amazon.com/dp/B007I7KYGS/ref=cm_sw_r_apan_glt_i_KWWCZ5YDWP6E42R61Q0C?_encoding=UTF8&psc=1

The pan tablets are more effective than vinegar:

https://www.amazon.com/AC-Safe-Pan-Tablets-Humidifiers/dp/B007I7KYGS

https://www.amazon.com/AC-Safe-Pan-Tablets-Humidifiers/dp/B007I7KYGS