Sticky rear derailleur solved with boiling water.
Hi all. Despite cleaning and lashings of wd40, my old derailleur was sticking (it seemed that the return spring had lost its power). As one last attempt to solve the issue I thought that salt (I use the bike every day in all weathers) from the roads may had caused the issue by seizing up the spring. Hoping that boiling water would dissolve the salt I soaked the derailleur in boiling water and hey presto the mech is 99% sorted. Anyone else had similar problems and put it down to salt?