Dawn...
Arctic Pak material is almost identical to some car covers...here is a "how to clean" ...I have had such a cover for decades and it looks and feels just like the thermal liner in my Hawk..these directions are common sense stuff...mild detergent, cold water, air dry...I would first call FWC and ask them about cleaning the Arctic Pak
Phil
Cleaning
All of our covers are easy to wash. For a light hand wash, install the cover and spray the it with a water hose. Dilute a mild liquid detergent, like Woolite, in cold or warm water and lightly cleanse your cover with a sponge. Feel free to clean the inside of the cover by installing the cover inside-out on your vehicle.
For a deeper clean, such as to remove tree sap or bird droppings, use a large commercial washer and set it to a "delicate" cycle to avoid causing any rips or tears in the fabric. Using an at-home washer is not big enough to clean your cover properly. When washing your cover, we recommend using a delicate soap such as Woolite. Do not wash your cover in hot water, as this will cause shrinking. Finally, to preserve your cover’s water resistance, we recommend running your cover through multiple rinse cycles.
Once your cover is washed, DO NOT place the cover in an automatic dryer, as this may cause the fabric to shrink or melt. If possible, we suggest air drying your cover at all times.