dAndrea Lemon Oil

I use lemon oil to clean rosewood fretboards from the dirt and grease that builds up over time. I have heard that some lemon oil product can act as solvents and damage the fret bindings over time. So I advise that the use of lemon oil is done sparingly and not every time you change strings. Even if you play everyday as I do, dirt will still take 3 or 4 months to build up. I clean the fretboard of my guitars 4 times a year and dAndrea Lemon Oil has done a good job and caused no problems.
Maple fingerboards are usually treated to a high gloss finish and do not need lemon oil to clean.
If you have an ebony fretboard I would advise using lemon oil only once a year.
Use dAndrea Lemon Oil very sparingly and one bottle should last a very very long time depending on how many guitars you own. It this respect it is extremely good value.
Don't use this product any wher else on your guitar or any other wooden intrument.

Regarding to cleaning effect well some things clean better but leave smell and dry out the wood. This cleans good enough and conditions wood as well.
It does not smell. I mean I am not noticing it and if it was smelling to strong or bad I would not be able to use it. I am talking about once it "dries" out.
Does not feel sticky. Sure use common sense and do not use to much.
Some of the solutions have darker color and can be used to change color of some fret boards like Pao Alto so it looks more like Rosewood but then they might color maple neck or back side of the necks that have maple on it. This one is great alternative when you do not want to change a color of your fret board. It does make fret board bit darker looking if it was to dry before applying but color stays the same it just gets deeper/darker.
I am not sure how does it work over time but "Lemon Oil" is known product used for long time so I do not expect that this one is capable of doing anything bad to your guitar finish short of if you would sink guitar into a pool fool of it and let it soak for years.
I use this one and Dunlop product for the function when I do need to help lighter color Rosewood to get bit darker.

I used it on my Indial Laurel fingerboard of my Squier CV 60's Jazzmaster.

It cleaned it up nicely and also hydrated it very well, as it was very dry and a bit dirty from the factory. Color-wise, the fingerboard was a bit grey-ish s oafter I used it, it became darker, closer to a rosewood colour and not so dry to the touch.

So it works well, a little goes a long way and smells very nice. The only downside was the bottle's plastic cap which has to be pushed down to be opened as a prevention, but it broke and I couldn't open it after just one day.

I would recommend it for fingerboard cleaning, but it seems the packaging is a bit cheap and next time I will buy something a bit more expensive for the very reason.