Just curious, what is the cause of interior glass water coming off grey? I’ve always explained a gas fireplace can do that, but feel the HVAC vents need cleaning.
Any other theories?
Just curious, what is the cause of interior glass water coming off grey? I’ve always explained a gas fireplace can do that, but feel the HVAC vents need cleaning.
Any other theories?
Saw some grey water after I cleaned the interior windows & skylights. They weren’t done in several years, and they were dirty. So my guess is dirt/daily life stuff.
length of time since last cleaning and/or minimal use of candles/other burning things
black = lots of candle/wood fireplace/burning things use
white film - natural gas use (fireplace, heater)