guitars

10 years??? Wow man. Do you even play? Lol

Seriously though, for the majority of your guitar, alcohol is fine, but most luthiers use naptha to cut through just about any gunk. It evaporates very cleanly without any residue. Safe for almost every finish and wood type. That shit is like magic, but it's extremely volatile, so don't smoke around it, or breathe it.

That being said, if you use it on bare wood (such as an ebony or rosewood fretboard), you'll definitely want to oil it afterwards. Lemon oil is the go-to here. You don't have to use much. Just get the fretboard wet with it and rub it very clean with paper towels. I've used tung oil in the past and that works fine as well.

I wouldn't use any kind of water based anything (soap) as that's going to leave residue everywhere.