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If using windows download MSI Afterburner (works for any Nvidia card) and play with the Core Clock and Memory Clock settings. https://www.msi.com/page/afterburner

Thanks for reply. I was asking for settings for best results in afterburner I am already using it I get a hashrate of 19.5 for 1060 6 gb

You really need to try it out to see how much high you can go without crashing miner or windows. I've got 4 different kinds of 1060 and it quite varies. On one brand I can go up to 850 and on another brand max 450.

Interestingly I can get around 19Mhs on MSI Armor 6G and much cheaper Asus Dual 3G can do around 23 Mhs

You would have to play a bit with the setting to find what values will be stable for your card. You can try to set memory Clock to 200, 300, 400, ... all the way to 1000 to find a value that works for you. Higher the better, but too high will make your miner to crash. I'm using 450 on one type of card and 850 on different card. For core clock 100-150 worked for me.