The best way is to follow a daily cleaning schedule that would ensure the cleanliness and longer usability of your sunglasses.  And in case, you unable to follow a daily cleaning schedule and may follow a weekly or monthly cleaning schedule that means, you might be pushing your sunglasses towards a point, where they would emerge into something like a scrap or a piece of filth.

Thus, to avoid this situation and to put your glasses on full use, ensure its sustainability and protect its original finish, follow on the following tips:

• Daily employ the exhaling breathe on the sunglasses, and then gently rub on the sunglasses by any soft cloth. In case you observe that this sufficiently removes all the grime, then OK, otherwise, wash your glasses in warm water, and then start cleaning with a soft linen or cotton cloth, don’t use tissue or paper or hard cloth, it will bring scratches on your glasses.
• You think, simply washing in warm water is not sufficient, there is stacks of grime or filth, then use washing detergent to properly wet the hard stains and grime. After making the stains and filth properly wetted, again put your sunglasses in warm water.  When you think all filth appear now removing, then wash glasses in warm water.
• After washing the glasses, gently rub with a cloth to clean your glasses.  Clean all parts of glasses, like lenses, nose-pads, joints, and screws. The body oil can also aptly remove the filth seen on the joints and screws.
• By regularly checking your sunglasses and by taking preventive measures of maintenance, you can evade your sunglasses from stacking the filth on it, in its beginning.  Thus remain enjoying your highly cleaned sunglasses with its original finish, and you may save yourself from the hassle of frequent repair and maintenance.

By ensuring upon the guidelines provided here above, we can say with full surety that your sunglasses will make you satisfy for a longer time, and this exercise will lend you a brilliant glasses usability as well as unparalleled vision boost up.