Orchorsol wrote: Sat Nov 09, 2024 2:35 pm
Dulcetto wrote: Fri Nov 08, 2024 5:02 pm
... Brillo pad.... Oh dear !!
Indeed. May as well have used sandpaper then.
Indeed, if the horn was lightly tarnished and could be easily polished with a cloth, liquid polish and elbow grease, then using a brillo or steel wool is a dumb thing to do as all this achieves is scratching the metalwork which is as difficult to rectify as it is completely unnecessary to start with. I do get irritated when I receive machines with obvious signs of steel wool use on the metal parts when elbow grease, metal polish and a cloth would have done a better job without the damage.
HOWEVER, this aluminium horn has corroded beyond the point that the latter would rectify. It actually needs to be "filed down" with something course and abrasive to smooth off the rippled surface and metal deposits caused by corrosion. As I stated earlier in this thread, I have had some minor success using coarse grade sanding paper on a corroded aluminium horn but it is an exceedingly long-winded and difficult task. On a horn of this size I can't imagine how long it would take and I would probably give up!
The object of the exercise is to flatten out those surface deposits and then you have to use lesser grade papers to rub out the scratch marks, followed by wet and dry fine grade and finally metal polish and 0000 grade steel wool. The horn I started was far worse condition than the one in question but the area I finished off ended up looking like new with a mirror finish and without any marks in it whatsoever.
My point here is that a brillo pad on this horn won't have done any harm to it at all given its corroded state so extreme caution isn't honestly required. On some plated or softer base metals, I'd agree steel wool or brillos are often used as a quick shortcut to hard work and can compromise the finish forever. Not so here in my honest opinion.