A well-maintained axe is a must for every guitar player; poorly maintained guitars can potentially make learning harder for the inexperienced guitarist, and makes playing less fun for those who know their way around a fretboard. Here are three tips to keep that guitar - and hopefully your playing - in tip-top shape.
An important note: I use these methods regularly on my guitars, an Epiphone Les Paul Standard and a Paul Reed Smith Standard 24. Both are poly-finished guitars, and these methods do not harm the instruments in any way. However, I have NOT tried these things on nitrocellulose finished guitars or acoustics of any kind. Make sure you know what kind of finish you have on your guitar!
WD-40
This is a great little spray which will keep your strings in excellent condition, even with regular playing. It seems to prevent the plain strings from corrosion, and it definitely helps keep all of the strings clean. Have you ever seen the gunk that collects on strings after regular use? Get a small can of WD-40 and a non-abrasive cloth (I use a microfiber cloth). Spray a small spot (an inch in diameter, perhaps) onto the cloth, and pinch one of the plain strings with that spot of WD-40. While pinching, slide the cloth up and down the length of the string. Dirty strings will leave behind dark trails of crud (for lack of a better term) in the WD-40 spot on the cloth. This keeps your strings feeling new and slippery (which I personally like).Pencils
I have applied this solution several times to guitars which friends of mine own. Many guitars I have played suffer from this problem (my Epiphone as well); strings get caught at the nut, causing issues with tuning stability. This problem distinguishes itself clearly with a ping-ing noise while tuning up. Even though you may be able to tune the open string to the proper pitch, the string may go out of tune when struck. I use a pencil of some sort - mechanical or wood, it doesn't matter - and rub the lead in the string slots on the nut. If you are not aware, the nut is the piece of material (it can be various materials) which has slots to hold each string at the headstock. The graphite in the pencil lead acts as a lubricant, and allows the strings to slide easier.Meguiar's
Their name has become synonymous with automotive care products, but they work so well on guitars (see the important note above) that Fender has released polishes and such made by Meguiar's. I use two products that I've found in the automotive section on my PRS: Scratch-X and the Deep Crystal System Carnauba Wax. The Scratch-X helps to minimize the surface scratches in your finish; don't expect miracles, but it sure helps. The Carnauba Wax gives the finish a deep, mirror-like shine. If you have a good looking finish, this really helps bring it out. For both products, apply with a non-abrasive cloth (again, microfiber is great), let it dry, then wipe off; I apply the Scratch-X first then the Carnauba Wax.
These methods help keep my guitar playing its best, and make it feel its best in my hands. Rock on!