Wd 40 all purpose lubricant wd 40 4413788 a 400ml aerosol can of wd 40 the industry standard lubricant and solvent mix which penetrates disperses water and lubricates it is ideal for cleaning machine parts prior to dismantling or repair freeing and lubricating at the same time because of its electrically insulating properties wd 40 is ideal for automotive electrics where it readily displaces moisture and helps prevent tracking wd 40 4413788 aerosol can 450ml