In this case, it is sustainable because the exercise is resourceful. It is resourceful, because once you have bought your next batch of shop rags in bulk, your good housekeeping practices, already in place, simply gets better. You may have not noticed this before. But now, in good time, you will. Previously, whatever cleaning you were doing ended up doing more harm than good. This was because, in the process, you were utilizing cleaning detergents that were made up of a batch of harmful chemicals.
We often do not notice these things, and nor do we fully appreciate it. Just how easy it is that we get sick. One day, you are fine, the next day; your GP has booked you off sick for a couple of days. While he may have made the correct diagnosis, he is none the wiser either. He does not have a clue as to the original source of your illness. But if he cares as much for the environment as you do now, he may be able to better inform you.
In all likelihood, he is also relying on renewable and recyclable and chemical free cleaning detergents to keep his surgery, not just surface clean, but germ and disease free. But, of course, he cannot ever be found wanting. He cannot ever engage in cheap alternatives. He, in his position, cannot rely on the cost-effective principle of buying in bulk. Even if he is going to be utilizing generics, he has to make absolutely sure that his remedies are not just effective but safe to use. Your environmentally friendly rags, let’s just state this for a fact, clean your shop effectively, and because they are free of chemicals, are safe to use as well.