Since i wan't satisfied the way suzuki mechanic cleaned Air Filter on both tunings, so thought to clean it myself. 
Here is the filter and kerosene oil in pot before cleaning,

Cleaned the filter with kerosene oil first, dirt can be seen in kerosene oil after cleaning.

Then prepared washing solution using liquid dish soap.

Wahed it in solution...

After washing, rinsed it in clean water till all the soap got out of it.

Left it for drying in sun. Took about 2 hours till it got completely dried.

Then i took a shopper, poured quite a bit of oil in it and put the filter also inside it. Then massaged it gently till all the oil got soaked up into filter.

Then took the filter out and squeezed the oil out of it as much as i could. No pic of this step, you can imagine why 
Here is the filter after all cleaning and oiling. Ready to use. 



