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Cleaning speaker cones

What would be a recommended course of action for getting rid of these stains? I was thinking of trying out a pencil eraser.

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PXL_20240519_190556062.jpg
 
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I start with one of these shaving brushes. It also good for cleaning dust on amp panels and mixers, and on instruments around the bridge, pickups, tuners, and nut.

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Speaker cone stains could be mould. Not something that you want to breathe. I find that a gritty borax solution with water works. The grit offers mechanical removal, borax will kill the mould. But you have to know what you are doing. It’s easy to do more harm than good.

 
If a soft and DRY paint brush used gently on the cone doesn't remove enough, or any of it, leave it alone. Your choice to throw away good driver(s) or cover the metal grills with speaker cloth to hide it, designated speaker cloth. If the looks really bother you enough to go this far of course. It is a shame when this stuff happens (it bothers me I know, so I sympathize). Just avoid making it a worse problem.
 
I start with one of these shaving brushes. It also good for cleaning dust on amp panels and mixers, and on instruments around the bridge, pickups, tuners, and nut.

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Speaker cone stains could be mould. Not something that you want to breathe. I find that a gritty borax solution with water works. The grit offers mechanical removal, borax will kill the mould. But you have to know what you are doing. It’s easy to do more harm than good.
Never use water on a (paper/pulped) speaker cone.
 
Never use water on a (paper/pulped) speaker cone.

As I said, you have to know what you are doing. A slightly damp cloth is not the same as using a lot of water and soaking it. Exposing a cone to high humidity or worse, rain as found in live conditions isn’t a good thing. It happens.

As you know, old speakers are mostly pulp based paper, many modern paper formulations offer more protection. Vintage reissues can be an exception.
 
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I've never considered cleaning my bass cabinet/amp or home audio speaker cones. Why do they need cleaning?

In general they don’t.

Dust can be brushed off. Mould is more serious because it can spread and isn’t healthy. Cabinets can get mouldy as well, often due to poor storage conditions and what’s in the environment. Cat spraying is another problem to contend with. Mouse/rat pee. These sort of issues come up when restoring old cabinets.
 
Never use water on a (paper/pulped) speaker cone.
Great advice. Paper has fiber content designed to create a basis weight for the caliper which specifies the strength and rigidity factor. This fiber has additional specifications and it not just a filler.
Adding any moisture will be absorbed by the fibers and swell creating a weak spot that is not controlable.