Zipper:
Should be always zipped when not in use to maintain the shape of the bag. 

Removing Dust:
Gently use a soft wool brush to remove the dust in the bag.
 
Proper Washing:
Can be dry cleaned or hand washed. Use normal water temperature with mild laundry detergent or mild soap. Gently rub the fabric and rinse. Do not squeeze and do not tumble dry.

Put in a dry ventilated place and avoid areas with direct sunlight to preserve the fabric and prolong the usage of the bag.

Not recommended to be machine washed. Avoid using stain removers or bleach.

Stains:
Stains can be removed using a clean cloth or a sponge with water and rub on the area.

For tough stains, mix a small amount of ammonia to water, soak the bag for 10-20 minutes and wash normally.