Hello,
I am a vendor for grease lubrication systems.
Often I also come across my clients asking for recycling of spent grease.
As the cost of new grease is quite considerable, I think the recycling concept is quite viable.
Are there any such practices worldwide in general and India in particular ?

unless grease is in factory sealed contianers I think the chance of contamination is high and as sucj recyleing will not work.
in that no way to filter or clean grease to be sure it is OK
bruce