Fast Fret is a widely used product which extends the life of your guitar strings. Just glide it on with the applicator and wipe it off with the provided lint-free cloth.
It keeps your strings extremely clean and allows you to play faster. It also reduces excessive finger noise. It's not a spray and contains no silicone. It's a liquid in an applicator. Use it on strings, the fretboard and the back of the neck. Lets fingers slide freely, keeps strings clean and is good for the wood.
A secret of the pros!