Drying cloth model top-notch! Leaves no streaks or water behind, and with the larger model, there's no need to wring it out for an entire car (or even two for that matter).
Wash at 40-60 degrees without fabric softener. Avoid regular laundry detergent as it often has the ability to 'seal' the fibres, decreasing the cloth's effectiveness. Just running hot water or APC/Alkaline (a capful in the machine) usually works wonders.