This is not intended to tell anyone how or what they should be doing; it is just sharing with you what I do. Here is an excerpt from my detailing notes. I know there are a lot of different techniques and products out there and I'm sure most work very well too. This is just what works for me on my black "09" Mustang.
Car Wash Procedure
Wash in the shade when it is cool out! RINSE, RINSE,RINSE your mitts, tools etc. often!!
Use a quality car wash soap (only)
(Don't use hot water it will soften wax. Don’t use dish washing soap it will strip off the wax)
1. First do under all the wheel wells with a high pressure nozzle to break the crud loose. If the wheel well require an oil and grease cleaner, spray the cleaner on, scrub it with a brush (brush is ok here only) and then use another shot from a high pressure nozzle. After the wheel wells are done, remove the high pressure nozzle. For the rest of the wash use a steady stream directly from the hose, a high pressure nozzle can damage paint. (IMO) Next clean the wheels with car wash soap, and an older mitt, and bucket dedicated to “tires and wheels only”. Two to three times a year, use a wheel cleaner product. If you decide to use a wheel cleaner, get the right one for your wheels. Chrome, steel, and roughcast aluminum wheels typically require a different type of cleaner than polished aluminum, etc. The label on the cleaner will state which application is correct. The wrong product may etch your wheels, so be careful. Work one wheel at a time. Drench the wheel with water, and then either use the mitt to apply the soap, or mist the wheel with the wheel cleaner. Immediately start washing the wheel and finish as soon as possible. Don't let the soap dry. Rinse the wheels thoroughly after each cleaning. Then clean the tires with soapy water and a tire brush, rinse immediately (don’t let soap dry)
2. Rinse vehicle from the top down thoroughly with cold water from the hose. Use 2 quality sheepskin wash mitts (one for top surface panels and one for bottom surface panels) dedicated only to the painted surfaces of the car, and two five-gallon buckets (with grit guards) labeled “Painted Surfaces Only”. This is the “Two Bucket Method"; it involves using two car wash buckets, each with a Grit Guard. The first bucket is filled with clean water and labeled “For Rinse Only” and the second bucket is filled with clean water and car wash soap and is labeled “For Wash Only”. Dunk your wash mitt into the soapy car wash solution and gently glide the mitt over the vehicle in straight lines following the direction air flows over the panel. Be sure to start at the top and work your way down. DO NOT SCRUB. Allow the soap solution to do its job. Dunk the mitt vigorously into the bucket with clear water to rinse the mitt thoroughly. DO THIS OFTEN!! at least every panel! Rinse each section of the car immediately after washing it. Do this in sections starting with the roof, and then rinse; next move to the hood and then rinse; nose and then rinse; front fenders and then rinse; doors and then rinse; rear glass, rear fenders, rear lights and bumper. Every time a body panel is finished, rinse that body panel AND THE MITT. (RINSE, RINSE, RINSE)
Once you have washed and rinsed each section; do a final rinse using only the steady flow of water from the hose. Start at the top and you will notice the water sheet right off of your car. This floods the vehicle surface and by providing more water volume, you allow gravity to pull the water down and off your car.
Drying Procedure
Use a leaf blower and quality microfiber WW .
Blow from the top down with a leaf blower. Make sure it’s new and never been used to suck. Let it run for a few seconds before aiming it at the car. Be careful that you do not point it at the ground!! After using the leaf blower, mist the car one panel at a time with FK-425 and blot dry to remove and residual water or water spots.
Microfiber Towel Dry
*See Notes section (CD Scratch Test) for using a new towel. Always wash microfibers prior to use.
Only use designated microfiber waffle weave drying towels; Use QD with them for lube. Put the microfiber towel out flat on the car and blot it dry. Do not pull it or rub it around, only blot the car dry. (Never use it when it’s dry as it can potentially scratch). When the only thing left on the surface are tiny micro beads of water (really noticeable on a black car), wipe them off with a QD (FK-425) and a pass or two of the waffle towel to leave the surface bone dry. This drying technique is excellent for black cars. This process never includes scrubbing, rubbing or applying any pressure whatsoever. The only time that pressure needs to be applied to a paint surface is when you are polishing
Most importantly when drying; the car should be clean. If any dirt is wedged between the towel and the car it will scratch the paint. These minute scratches usually aren't noticed immediately.
If you drop the towel on the ground, get a new one before continuing to dry the car.
If any water spots are noticed after drying go onto Water spot removal section now. If no spots are visible continue on:
Tire Dressing Procedure
Apply tire dressing with designated foam tire applicator in multiple coats. VERY THIN coats to help prevent slinging