Best first step is to purchase our 303 Fabric Guard and treat your purchase for UV protection an sealing of the seams and needle holes better. 
Magnetic tankbags must be hand washed.
All other luggage:

1: Remove ABS inserts

2: Remove all the buckles / hooks you can.

3: Machine wash,
a) A Wool-lite type soft detergent
b) cold water
c) gentle cycle
d) run through rinse cycle twice if possible to assure soap is gone.

4: DO NOT PUT IN THE DRYER!!!!!!!!!

5: Hang the luggage in a garage or place where it can drip dry.

6: When it's about 75% dry, replace the ABS inserts, stuff as full as you can with
wadded up newspaper and let dry the other 25% of the way. This will "Iron" them from the inside out removing the wash wrinkles and make the luggage look as good as new. ;-)

7: Recoat with our "303 Fabric Guard" (only product with a "UV" protectant in it.

8: Reinstall on motorcycle and go ridden!! ;-)