Two-bucket wash: stop swirl marks at home

Use one bucket with shampoo and one with clean rinse water. Dunk the mitt in soap, wash a panel, then rinse the mitt in the clean bucket before reloading soap. Why it matters: grit stays in the rinse bucket instead of grinding into paint. Work top to bottom. Wheels last - they carry brake dust. Dry with a clean microfiber, not an old T-shirt. If water spots form in sun, mist quick detail spray and wipe immediately.