I had bought Jopasu Car Duster two months back and used atleast once a day. It had become very dirty and my family members were annoyed whenever I use it and I was fedup telling them its not a washable thing. Then finally decided to wash it and didn't cared about end results.
It took more then 4 buckets of fresh cold water to clean the duster. Each time I dip the duster into clean water and rinse, the water becomes fully dirty but I didn't used any detergents or brush. Used more buckets of water till all the dirt goes off and leaves clean water. Then Soaked it for 30 mins and put it for drying where there is no sun light or dust.
Now the duster is fully dry and fortunately works good as before. Really!
If you guys really wanted to clean the duster, use multiple buckets of fresh cold water and no detergents or anything. Just rinse in water like washing machine does and when the water gets dirty, use more fresh water. Soak it if required and dry under cool place. Thats what its said in duster cleaning instructions.
Detergents and sun light are the main reasons to weaken the fabrics.
Don't you think this much of dust collected in duster harms the car paint? Well, now on I will clean my duster every 2 months.
Thanks... Best Regards