Query on water well cleaning

Cleaning of water well.


We have 3 old wells. We want to clean them up internally such that the mud below is removed and the springs that are the source of the well gets recharged. One of the wells is giving a foul smell in the water and another one is giving a little salty water. Could you please guide me on this?

Also there is hardly any water left in 2 of the wells, we seem to have reached the bottom, there is barely 1 ft water in them.