About the D'Addario PW-XLR8-01 String Lubricant/Cleaner:
 
D'Addario XLR8 removes friction for faster playing while cleaning your strings for extended play and new string tone. XLR8 also conditions the fretboard. Simply take the ergonomic applicator and wipe up and down the strings and that’s it. Comes packaged in an airtight container to ensure long product life.