A few years back I was a little too aggressive with soapy water cleaning my Stevens 368 scope, and managed to get water inside the brass internal tube containing the objective lenses. I wasn’t sure what to do, I ended up placing it in the kitchen oven at 300 degrees, and the water droplets inside disappeared without any harm.

gnoahhh wrote on May 24^th, 2022 at 8:12am:


If the "fog" is an actual deposit(crud), use non-abrasive GoJo, a hand cleaner available in auto parts stores. Rinse well and apply a little Dawn detergent (DO NOT wet the lens excessively if it's a compound lens). That will eliminate fogging from moisture. Moisture fogging a lens is being adsorbed (not absorbed). That is, it's piling up on the glass too fast to spread out so you can see through it. ANY detergent will eliminate fogging from moisture for a while. The detergent is simply spreading the moisture out so it's not visible as "fog". How long depends on the quality of what's applied. So, you're probably going to have to redo the scope every once in a while. To demonstrate this, apply a little Dawn, etc. to one lens of a pair of glasses and pass them both over an active tea kettle spout.