How To Clean Your Guitar Strings. A lot of grime builds up behind the string, so this method is crucial to properly cleaning the string. After that, gently pinch each string between your thumb and index fingers with the cloth in between, and swipe up and down the string length.
Also, never use the household and furniture wood cleaners because they can damage your acoustic guitar. Apply a small amount of lemon solution to the clean cloth or paper towel and rub it into the fretboard.
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As simple as it sounds, cleaning guitar strings can be done every time you play. Basically the idea is you use regular isopropyl rubbing alcohol, put it onto a cotton swab or some sort of cleaning cloth, and use it to clean your strings, rubbing it the length of your guitar strings, and getting all the dirt off, and all the grime off, helping your strings to last longer.