Thank you everyone for your respones. My Tahoe is a daily driver and I just hate it when I go to the car wash and more swirls and light scratches show up. I know whatever I do it won't be perfect but I would hope for very good. Once again, thanks.
It commonly is washing, and what techniques and tools are used to wash a vehicle. Running through the auto washes is just about the worst for being swirl makers.
Study up on two-bucket washes, and perhaps at least buy some grit guards for the buckets, a good chennile wash mitt.
Many vehicles today are two-stage paint. It is the top clear coat that is swirled, not actually the black paint underneath.
Basically any protectant wax, sealant etc lessens such from occurring to paint, but to what point, and for how long?
As for hand polishing with something like M205, it applies like a wax and is not that hard to apply, nor remove, use a soft clean MF Applicator, and lightly spread a decent quantity like 5-6 drops or so in a 18"x18" area, put a little elbow behind the pad, but try for even application and pressure throughout, and to duplicate what you do on an entire panel. As the pad gets dirty as you go, either wash, and dry as best you can, or switch to another clean applicator. Working clean always helps. Same with MF Towels.
Always do such processes in total shade, out of the sun, and on paint that is cool, not hot. Same with waxing-sealing, always out of sunlight.
Masking trim is always a good idea, as many polishes can stain trim, and be tough to get off.
Such by hand, can take a good number of days to do. If you have the time, and the will, one can eventually get though a vehicle, hand polish all panels, and then as always, protect with a good sealant, or wax.
A good wax that won't break the bank, and is very durable are the Collinite products, such as 845 Insulator Liquid Wax, or Collinite 476 Super DoubleCoat Paste.
For good very durable and very inexpensive Sealants, some great ones are Duragloss 105, or choose Duragloss 501 for even more cleaning power. Car Quest commonly carries this brand. Sealants need to cure, apply thin, let sit 30-40 minutes, then remove. Then keep up the finish with something like Duragloss Aquawax after washes.
Mark
---------- Post added at 05:26 AM ---------- Previous post was at 05:06 AM ----------
All Paints at some point become contaminated with many things. Saps, paint overspray, industrial fallout, iron particles, etc.
Polishes can remove some, but its usually the wrong tool, and process for such. Claying a paint is a step that is commonly performed before polishing ad claying will more easily remove such bonded on contaminants.
A simple plastic baggie test will tell you the surface condition of your paint. Find yourself the thinnest dollar store sandwich bag, place your hand inside of it, and feel the surface of your clean and dry paint. Yes, like sandpaper, right?
Even after hand, or even machine polishing, the paint may feel no different, just glossier. That's why Claying is usually advised.