While I'm on this subject, I would like to mention some words of wisdom that a friend once told me. "Don't put your guitar in a place that you would not be comfortable in yourself". Keep your guitar out of any extreme temperatures.
Also, do not ever, ever, ever, use the following items on a guitar :
- Lemon pledge. Its great for furniture but not for guitars. For instance, if you have a rosewood fretboard and it looks dry, use lemon oil that is specially formulated for the guitar. You can find it in your local music store.
- WD40. Again, this product is great, but not for guitar stuff. Using this stuff can damage your finish.
If your guitar looks dirty, use guitar polish. There are many different types and all of them are pretty good. You can find this at your local music store.