Camera fogging, how to deal with humidity?

Question

CCTV

Good afternoon!
https://www.aliexpress.com/item/BESDER-Yoosee-IP-C...
There are two such cameras. When the temperature drops outside, sometimes the glass (more precisely, the plastic and the lens) fog up. Sometimes water enters the chamber in an invisible and incomprehensible way for me. I have already dried one twice in a year) Inside I spilled everything with ordinary plumbing sealant - it seems to “save”, but maybe someone knows a more “effective” way?

Answer 1

Open the chamber and find a place where you can hide a bag of silica gel. You can either buy it, or take it from shoe boxes (Do not eat bags), or buy a silica gel cat litter box and build a bag yourself. Change once a month. Water in the chamber collects due to heating and cooling (day/night cycle or warm/cool). If the camera is badly assembled, it will still suck. The sealant must be poured carefully, the vapors, when dried, can gobble up the solder.
PS The textolite from which the boards are made is hygroscopic, it can give off water for a long time. Do not dry with a hair dryer, you can damage the board.

Answer 2

Outdoor cameras are often placed in a casing with a heater.