Why clean em when you can sell em!I use Fret Doctor oil on mine once or twice a year. That said, I tend to flip guitars before the fretboards get too filthy lol. I’m trying to keep a core group now, so we’ll see how it goes.
A previous guitar player in my band never fully restrung his guitar. He'd replace singles as they broke. Which means he never even wiped down his fretboard. The amount of grime around the frets would make me sick. His fretboard likely hadn't been cleaned in years.I’ve never had a fretboard get anywhere NEARLY that filthy. I don’t even know how that happens. 🤮
I definitely wouldnt use the product of your choice when it comes to oil. For instance using an oil that goes rancid wouldnt just be a mistake because it may stink, the problem is it not evaporating over time. If the oil doesnt evaporate it'll just damage the wood including unseating the frets. The idea of using ATF sounds crazy, it never dries. Fretboards arent bearings needing lubricant.Good reminder. I've seen my fair share of dry dirty boards myself. Don't go crazy though, once a year oiling is all that's needed. Use the product of your choice, they're all better than nothing. Personally, I use mineral oil, which is what most commercial fretboard oils are, some with some lemon scent added. Just don't use an oil that will go rancid over time...lol.