A nice tool to have in your case.
The folding ABS plastic unit is slim enough to fit under the strings of even the slinkiest guitar. Dual terrycloth pads gently scrub the strings removing caked on dirt.
For heavily oxidized strings we like to apply some Isopropyl Alcohol to the white pad, the run up and down the strings, flip over and repeat.
We include a FREE pair of replacement terrycloth pads.