Cleaning Brushed Aluminum Faceplates and Knobs on Vintage Gear

To clean a brushed aluminum faceplate, unplug the unit, start with a soft dry cloth and a soft brush, then move to a cloth only lightly dampened with mild soapy water if you need more, and dry the surface right away. Skip solvents, alcohol, abrasive pads and polishes: they can strip the printed lettering and the finish. Work along the brushed grain, keep liquid out of the controls, and stop when what is left is wear and not dirt.

This guide covers metal faceplates and knobs only. Wood cabinets and veneer need different care, and anything inside the case belongs with a technician. Everything here happens on the outside of a switched-off, unplugged unit.

Know What You Are Cleaning

A "brushed aluminum" faceplate is usually more than bare metal. Many vintage faceplates are anodized aluminum, which means the surface has a hard oxide layer that is sometimes dyed. Lettering and scale markings may be printed or filled on top. Each layer has its own limits:

• Anodized finish. It is a coating on the metal, and strongly acidic or strongly alkaline cleaners can attack it. The outer layer can also lose color with age, and some dyes fade more easily than others.
• Printed lettering. It sits on the surface and can lift off with solvents or hard rubbing. Once it is gone it does not come back with a cloth.
• Bare or lacquered metal. Some faceplates carry a clear coating, which can cloud or peel if harsh products are used.

You usually cannot tell which finish you have from a photo or by looking. That is the case for the gentlest method first and for testing any new cleaner on a hidden corner.

What to Gather

• A soft, dry microfiber or cotton cloth, and a second one for drying.
• A soft brush, such as a clean makeup or detail brush, for edges and gaps around knobs.
• Cotton swabs for tight spots.
• A few drops of mild dish soap in a small bowl of water.

Step by Step: The Gentle Method

1. Unplug the unit and let it cool. Never clean a receiver or amplifier that is switched on. Do not spray any liquid directly onto the faceplate.
2. Dust first. Use the soft brush and dry cloth to lift loose dust. Grit dragged across the surface is what scratches it, so remove it before anything damp touches the panel.
3. Try the dry cloth. Many fingerprints and smudges come off with a clean dry cloth. A maker's manual for one receiver says to clean with a dry cloth, and the same manual allows a soft cloth lightly dampened with a mild detergent solution for stubborn stains.
4. Dampen, do not wet. Wring the cloth until it is barely damp. Wipe in the direction of the brushed grain, not across it, so any fine marks follow the pattern.
5. Dry right away. Use the second cloth immediately so no moisture sits in seams or near the controls.
6. Stop if color or ink appears on the cloth. That means lettering or dye is lifting. Do not keep going.

What Not to Use

The same maker's manual warns against abrasive cloths, thinners, alcohol and other chemical solvents, because they can damage the finish or remove the lettering on the panel. That advice is worth following for any vintage faceplate. Add the following to your list of things to leave alone:

• Scouring pads and powders, which scratch the grain and wear through coatings.
• Metal polish, which is designed to remove a surface layer and can strip lettering or finish.
• Strong household cleaners, since very acidic or very alkaline products can attack an anodized layer.
• Soaking or spraying, because liquid can run into switches, potentiometers and gaps where you cannot dry it.

If a stubborn mark needs more than the gentle method, accept it. A lightly worn faceplate with all its lettering is usually better than a clean one that has lost its markings. Deep scratches and dents cannot be cleaned away, and refinishing changes the original look, so think twice before going further.

Cleaning Metal Knobs

Metal knobs collect skin oil and dust at the edges and around the base. For most of them, cleaning them in place with a barely damp cloth and a cotton swab is enough. Pulling knobs can be fiddly: some are held by a set screw, some push on, and some have inserts or markers that are only glued in. If your manual does not show how a knob comes off, do not force it.

If you do remove a knob with the unit unplugged, never soak it. Wipe the outside with the damp cloth, clean the inside edge with a swab and let it dry completely. Keep water away from the shaft, because liquid reaching the control behind it can cause scratchy operation. For crackling controls, our guide to fixing scratchy volume pots and switches explains the safe approach.

If a knob is missing or mismatched, a replacement may be easier than a repair. Knobs differ in shaft style and size, so match them to your model using the manual or a seller who lists them for your unit.

Reading Condition When Buying

Everything above also helps you judge a unit before you buy it. Look for brushed grain that runs cleanly, lettering that is crisp rather than rubbed away, knobs that match each other and no bright patches where someone has scrubbed too hard. Photos of the faceplate in raking light show scratches and pitting better than a flat front shot. Our complete guide to buying vintage stereo equipment and our look at what "serviced" and "restored" really mean help with the rest of the checklist.

If a faceplate is dirty because the unit has been stored in a smoky or damp place, think about the inside too. Dirt on the outside is easy to fix, but you cannot judge what is inside from a clean front. Our guide to reading the inside of a vintage receiver explains what a technician looks for.

When to Stop and Ask Someone

If you find sticky residue, flaking paint, white corrosion at the edges or liquid damage, stop. These point to problems beyond a quick wipe. Never open a powered unit to dry or clean it. A qualified technician can assess the controls and the inside, and a gentle exterior clean can wait until the work is done.

Our guide to replacing dial lamps in a vintage receiver is a good companion read if the dial glass needs attention too.