A good cover is probably the first step. Second, keep some auto paint detailer spray with you and make sure to clean bird droppings and whatever else off the plane anytime you are around it. Clean bugs off the leading edges of your wings, prop and cowling after every flight. If you do it immediately the bugs come off really easily and it only takes a couple minutes. The auto detailer clears off the bugs quickly and also leaves a protective coating which is especially important since the plane is out in the elements full time. In general if you are outside you will need to spend much more time cleaning the plane than if you hanger it.
Keep an eye out for birds and rodents taking up residence in your aircraft. The other day I cleaned half a buckets worth of nesting material out of my tail that a bird deposited there over the course of 2 days after the rag I use to keep birds out disappeared.
Keep the proper lubricants handy and use them regularly. I lube all the flight control joints probably at least every other week.
Clean, polish, lubricate
Clean, polish, lubricate
Thats your life if you park it outside and want to keep it looking nice. I'd love to get a hanger to decrease the workload but no hangers available where I'm at.
The Mooney tied down next to mine gets no love and it is just slowly wasting away. Never gets cleaned, polished or lubricated. Has a bird nest in the tail with chirping chicks in it. Bird crap every where. Definitely don't do that, just sad to see. Apparently it's for sale but I'm not sure who would buy it for what they are asking.