Experience or Research in the Use of Reusable Menstrual Pads?

It is becoming a normal practice in most rural areas in developing countries to have poor and vulnerable girls use old clothes and rags as sanitary pads.

This is owing largely due to the increasing price of sanitary materials, which the girls cannot afford. In order to curb this trend,  there has been some trainings on the reuse of reusable menstrual pads by small NGOs. 

In as much as this might sound interesting, has anyone done a research or have practical experience on the feasibility and hygienic nature of this process? Is this a sustainable solution?


Thank you in advance