I have been watching this thread for a while and was not sure that I even wanted to get involved...
There is a strong tendency to "want to be right" which is OK, but I would ask if the original question was even the correct one. More on this later.
If we talk about cleaning instruments, surely alcohol - in whatever form is just a small piece of the picture. So, I think that this thread has identified the organic contaminants, but is that all that we are after? If Alcohol does not "remove" the contaminants, could it possibly decrease our chances of getting sick with a quick disinfect?
And here is my bitch with this thread - we have all the expert opinions but have ignored the fact that alcohol is NOT a cleaning agent of choice for the home. Water, a surfactant and some brushes are the primary choice to CLEAN the instruments - get the organic material that gunks up the valves, spit valves, promotes corrosion and would need disinfecting in the first place. Once the instruments are clean, they play best. Alcohol can be used as a disinfecting agent AFTER cleaning. Just like corona, or any surgical activity, we ALWAYS scrub first, THEN disinfect.
Now, we could argue that excessive disinfecting actually is a bigger problem than cure in many ways. Our immune system is capable of developing when exposed to small amounts of "contaminants". Kids that play in the mud seem to be healthier than the ones "protected" by overzealous parents. Could we not have a similar situation with the trumpet?
So, now we have enough information to replace "theory" with practical recommendations:
Many of us use excessive oil to "flush" aerosols and contaminants out of the valve block - instead of cleaning. I generally oil once a week. Mouthpiece and leadpipe/tuning slide get CLEANING with water, dishwashing liquid and a brush at least once a week - perhaps more often if we gig A LOT. The whole horn gets a bath/scrub once a month/quarter/year depending on how much it gets played. That is probably enough maintenance for any healthy trumpeter.
I only use alcohol when someone is trying my mouthpieces or I am in a store trying new mouthpieces out. I have NEVER disinfected my trumpet. If I wipe down the outside on my gold plated instruments, glass cleaner seems to be a really good thing.
So, I think that we have to pick our words carefully, otherwise we are just arguing about NOTHING.