Hi howarda25! Welcome to all things Airstream. It appears you found a nice 70 Globetrotter. It looks like the "international" model judging by the emblem on the side of the trailer. These models have more amenities than the base model. The exterior looks to be in good shape from what I can see. And it has a "vista view" window above, a nice feature that sometimes leak.
You're right to spend some time cleaning your new Airstream as it helps you learn all about it. Look it over carefully and begin testing the various appliances to learn what it may or may not need. Usually old Airstreams have lots of needs. Experienced old Airstream enthusiasts usually say cosmetic improvements are the last on the list. Tires, brakes, bearings, axles, frame, subfloor, exterior lights, propane, electrical, plumbing, etc. are important for safe traveling.
That said, I did strip the old clear coat off my 66 Trade Wind. Both of our trailers are built with the Alclad 2032 T3 aluminum. This stuff is strong, and has a nice exterior layer of soft aluminum that polishes to a highly reflective surface. Just stripping off the old clear coat makes a big difference in how the trailer looks. Here is a photo of mine after the clear coat was stripped. Mine is the older body style. The new body came out in 1969. You're is the second year of the new body, and the first year of the round corner front wing windows. That's good as 69 front wing windows are hard to come by if a repair is needed.
Your trailer looks a lot better than mine did. My son has a 69 Globetrotter and it doesn't look as nice as yours. For now, I might suggest you just wash it thoroughly and enjoy.
Again, welcome to Air Forums.