50ml of lemon oil plus cloth

Lemon Essential Oil is a natural cleaner that removes dirt, and buildup from stringed instruments and other musical instruments.
apply evenly to the strings and let for a few minutes, then wipe off the excess oil with a clean cloth.

Guitar String Cleaner and Lubricant prevents oxidation and rust and can be used to lubricate strings.
 reduces the noise produced when playing.

string cleaning rubber is 4cm by 14mm by 8mm.