Step 1: Empty the bag prior to wash/cleaning. It could be done by turning the bag upside down and dusting the inside of it. Ensuring that the bag is empty
Step 2: Brush the exterior with a soft cloth to reduce the friction induced by other materials as it might damage the bag.
Step 3: Use a wet cloth and remove all visible stains. Detergent or soap could be used but ensure that the liquid is removed. Repeat till stain and detergent is removed
Step 4: Sun your bag for a couple of hours and soon enough, you'd have a new looking bag!