For years, a crappy Tasco 4x scope resided on my aging 1969 Marlin 150M. A “house brand” rifle, it was sold in Western Auto stores under the “Revelation” banner.
Upon inspection during regular maintenance, the scope lenses were found fogged up. Fortunately, I happened to have a BSA 3-9x32mm scope laying around that I had acquired in a previous trade. I will zero the combo during the next practice.