MACH I Member
Joined: Nov 2009
Hand washing has the draw back of direct friction of rag to paint rubbing away/buffing away the clear coat and grounding ANY debris on the car itself (or the microfiber) INTO the paint causing micro scratches (i dont care WHAT kind of cloth you use).
Spray washing can remove some of the clear coat and or have gritty/recycled detergents which can do the same as above.
There is no right answer, they both suck but both are necessary. Pick your poison.
I wash every week, rotating between spray, auto, and hand. I get the dead bugs off the front end and side mirrors every 24 to 48 hours, i put the spray on wax on the front every week and the whole car every two weeks.
There really are no "perfect ways" to handle paint maintance.
2011 Shelby GT 500: C&L CAI, Roush GT 500 Performance axlebacks, Steeda 2.65 Supercharger pulley with idler/belt tensioner, Ford SVT Custom Racing Tune, SVT package, Glass roof, Tech package
Gone: 2011 GT/CS Black
Gone: 2010 Sterling Gray GT, Track Pack