If automatic cleaner needs electricity,then it will be more proolematic to implement throughout India.
My data related to blackboards includes all schools(private and govt.)in rural and urban India.I can substantiate my conclusion with different surveys and datas prepared by govt. and non-govt. agencies that still in rural area more than half of the schools have negligible basic infrastructure.
As far as Mid-day meal scheme is concerned I have worked on this in 23 blocks.I know what type of food-grain comes for the food and how officials and department of education works on this?My NGO has also done survey regarding basic infrastructural facilities in government primary schools in seven districts.MOre than 40% of the schools showing different infrastructural facilities on the goverment-paper is false.Few government schools are even running on the paper only.
I am not sayiing that Blackboard cleaner would not improve the situation.But,it can be used only if there will be a blackboard.
If you will allow me,then I will present the datas of Planning Commission,Department of HRD(Govt. of India) and different state governments.
You are lucky that you found Blackboard in the village during field-work.
And,also please keep onething in mind that we were sent to those villages,where we can reach by easy transportation mode.But,there are thousands of villages in India,where even district administration and police cannot access in any extraordinary situations.Schools,blackboards and other infrastuctural facilities are remote things for those villages.
I appreciate your imagination for planning to adopt one BPL family by one tax-payer and Blackboard cleaner...but,these poetic imagination has extreme limitations.....
There are other basic needs of the infrastructure which should be addressed before thinking of automatic blackboard. May be there could be alternates like running