How to remove some stains from my camera lens?

Must buy: Blow-blown (preferably Swiss AF, blue) lens cloth, better around 30 yuan. Don't buy 3M. Mirror eraser can be used outdoors, but it is best not to use it at ordinary times. A piece of lens paper, not much money, but not used to clean the lens. If you want to buy lens water, buy Zeiss, and you don't need to buy anything else. Not cost-effective. Go to a large chemical store and buy a bottle of analytical grade ethanol, which will last you a lifetime.

The cleaning process is: first, blow off the dust on the lens surface with air. At this time, hold the lens with your left hand, tilt it at 45 degrees, and blow air at 45 degrees with the lens. If there is something that can't be blown out once, roll it up with two lens paper rolls, tear both ends, and brush off the remaining dust with a small brush. Then use one side of the lens cloth dipped in alcohol to quickly wipe the whole lens from the center of the lens around, and the action must be completed before the alcohol evaporates. Then wipe it twice with the dry half, so there is no flower path. Finally, it's OK to blow it twice with air. Then dry the lens cloth and put it away. Avoid dust pollution, and it is better to have gloves when cleaning the lens.

Don't always wipe the lens, just blow it at ordinary times, and don't touch it without fingerprints.