Southwest does beat the hell out of their aircraft so to speak, and they have had some issues make the news for maintenance, however, the things you list are not necessarily a sign of bad maintenance.
First is the fluid stains (oil and hydraulic fluid). What you are seeing might be oil, but not hydraulic fluid. Jet engines are very leaky with oil. I remember seeing British Airways come in (a 777) and the mechanics having to dump a couple quarts of oil in each engine. But there's something else you are not thinking of - de-icing fluid. It will also strip the paint over time. So even in summer, you can see evidence of it. However, I have never noticed any unusual amounts of this on Southwest, and I have flown them frequently.
The peeling paint is another thing that's very normal on any forward facing surface of the aircraft.
The interior items are simply due to the fact that they turn lots of flights, and hence more movement on the carpets and more getting up and down on the seats.
What always did strike me as odd was the number of doubler plates on their aircraft. Doubler plates are essentially a patch in the skin. I have worked with planes that were 30+ years old that didn't have 1/4 of the doubler plates their newer aircraft have. And these are in places that the ramp equipment can't reach. And it's funny this comes up - I was at the airport a couple weeks ago dropping someone off, and saw one of their aircraft sitting there at the gate. I was standing at the window and could see what I would call a doubler strip - or in this case two of them. On the top of the aircraft is the fuselage crown, which is the metal panels on the top. Where they met the metal along the side, there was a patch on both sides running almost the full length of the aircraft. This was in addition to the usual other double plates.
This is concerning to me because their biggest maintenance finding from the FAA (which was just a couple years ago) was they were skipping their metal fatigue inspections on many of their aircraft.
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