Hello Vivek. Paisepagal has a good point. Thank you for posting the coin here. I hope it is a valuable discussion and reading item.
Let's sit back and think why we want a coin in our collection. For me, the most important reasons are to conserve the coin (I am only a temporary warden of the coins in my collection, but I can preserve them for a while), to study them and to use them as reference, e.g. when I am asked to judge a suspicious coin. I don't need an unc coin to do this. What I need is a coin on which all the details are clear. In fact, in the case of rare coins, I will even accept coins with incomplete detail.
Therefore, my purpose when cleaning a coin is to change it from a coin where the details are not all clear to one with clear details: I want to remove the dirt that is obscuring the coin only. While doing so, I want the coin to remain as little changed as possible. I want to be hard on dirt, soft on coins. Not impossible, not easy.
Now consider the coin you cleaned. No more dirt. Good. However, your cleaning method also removed detail. Worse, as Tanka pointed out, it made many small scratches. Not so good. Your coins never get a better grade from cleaning. A shiny coin is not necessarily an unc coin. There must be a better method.
The better method depends on the character of the dirt and the metal of the coin. One extreme is that you just rub them softly with a soft cloth. Another extreme for coppers and bronzes is using prolonged baths in olive oil (I just cleaned a batch of medieval Chinese coins by keeping them in olive oil for almost half a year) and a wooden toothpick for stubborn pieces of dirt.
So when you decide to clean (many coins don't need cleaning,) if you have doubts on the method, just post the coin and we'll be happy to chat away and come up with a variety of opinions and thoughts.
Peter
