Hi
I have often advocated on this forum and GSM that the application of a blob of LGB graphite grease should be applied to the "screw holes" of anything outside which is electrical that includes point motors decoders etc.
I have done this for many many years and it does prevent the screws becoming rusted and therefore they can be easily unscrewed if nescessary.
afew years back a retrailer sold me some used point motors whichhad been in outside use for around 18 months, he did not charge me for the attached 55024 decoders as the previous user had taken no precautions and initially the screws were solid, (WD40 did eventually come to the rescue)
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As I have often mentioned when I started in G scale in '76 there were very few sources of advice ( if any) and the few users around in those days had to experiment!
I would say that it seems that many these days seem a little afraid to do anything without getting chapter & verse on things before daring to make a move!
Experiment a little you will be surprised what you learn!!