We were recently asked by one of our customers what washing material we recommend using with the Scrubba wash bag and we thought it would be useful to post our response here.
"At the moment we don't really have any firm recommendations for which cleaning product to use other than that the cleaning product should be a liquid (powders or detergent leaves take too long to properly dissolve). One of the reasons we haven't put up specific cleaning products (or included a cleaning product in the kit) is that every traveler has different priorities for cleaning products. For example, travelers such as myself prefer to travel as light as possible so if I can have a single product that can perform multiple tasks, I will choose it over a single purpose product no matter how much more efficient it is. In this regard, I will generally use a small dollop of 3-in-1 bodywash-shampoo-shave liquid in the Scrubba wash bag.
That being said, if you don't mind carrying extra products, carrying a very small (~25-30ml) bottle of washing liquid (e.g. Omo or the like) is a good idea when traveling. Washing liquids are probably the most efficient for cleaning your clothes in the Scrubba wash bag as they are purpose designed for removing oils and dirt from clothes. You really only need to use the smallest amount (probably a few ml per bag load) as washing liquids are generally highly concentrated. A good trial and error test for quantities of different cleaning products in the Scrubba wash bag is to do a few loads. If after 30 seconds of rubbing you still have suds, then you can probably reduce the amount of cleaning product for the next batch. Optimising the amount is not only better for the environment, but not overloading the cleaning product will minimise the amount of rinsing required.
Finally, if you are environmentally conscious, there are a number of bio-washing liquids on the market (often released by outdoor brands and available at camping stores) that are better for the environment (e.g. phosphate free). These probably fall somewhere between using bodywash/shampoo and a washing liquid in efficiency."