Posted by docsoma on 01/13/17 - 11:08 PM
#7
Sorry to pile on...but having ruined many valuable things from telescopes and cameras to cars and ignition systems because of overzealous cleaning I would take Phil's caution on pressure cleaning seriously.
In my experience using the mildest methods....physically and chemically speaking will yield superior results. Subsequently my aim is to avoid serious soiling in the first place to the extent possible.