If you insist on using tardis, spray it on one panel at a time, let it dwell for a couple of minutes then wipe off with a micro fibre.
Rinse the car, then wash a couple of times to remove residue.
Perfect time to clay the car as well, so after that dilute some fairy liquid into a spray bottle and use as lubricant for the clay, and let the clay do the work so don't apply pressure.
Use tardis on spots if needed.
Wash the car again then seal it with a quick detailer or similar.
If off the shelf then Autoglym Extra Gloss protection will do, then wax with what you have.
Thin layers as always with wax.
Do the finger test then buff off.
Text time you get sap it will just wash off.