A friend of mine who owns a music store told me that too much lemon oil can be bad for a fretboard, so windex is good in between to clean up the gunk in a fretboard. I'm not looking to shine it up and make it spotless, but my fingerboard is getting filthy and I need to remove all the greasy residue on it. Is windex a good choice in the meantime? I know it's fine on maple, but rosewood? I'll get some lemon oil next time I change my strings and thoroughly clean each fret, I'm just wondering if anyone has any experience. Thanks.