Waterless washing uses a polymer spray that encapsulates dust so it can be wiped off without scratching. On fresh, dry UAE dust it works well, and it is the value option at AED 30–60 for a saloon exterior. Its limits are mud, old bird droppings and heavy post-rain grime; wiping caked dirt without water risks marring the clear coat, and an honest vendor will say the car needs a rinse-based wash first.
Steam sits a tier up, usually AED 70–120 for exterior and interior. Low-moisture vapour lifts dirt with heat rather than friction, uses a few litres of water per car, leaves no puddles, and doubles as an interior tool for vents, fabric seats and light stains. If your car lives in a basement, waterless for routine visits with steam every fourth or fifth booking averages out cheaper than steaming every time.