We have a very old Kenwood mixer, with aluminium beaters. We
unfortunately put them in the dishwasher, and they are now covered in a
soft black deposit. What's the best way to get that off and if possible
restore the finish?

On 7/18/2016 12:57 PM, GB wrote:
We have a very old Kenwood mixer, with aluminium beaters. We
unfortunately put them in the dishwasher, and they are now covered in a
soft black deposit. What's the best way to get that off and if possible
restore the finish?

Wire brush, perhaps with brass rather than steel wire. A suede brush
would do, if you can still get them.

On 18/07/2016 12:57, GB wrote:
We have a very old Kenwood mixer, with aluminium beaters. We
unfortunately put them in the dishwasher, and they are now covered in a
soft black deposit. What's the best way to get that off and if possible
restore the finish?

Washing? We did that once to a garlic press which turned out to be
aluminium. Scrubbing it with a pan scourer removed the worst (so the
garlic came through white). Then 6 months or so of hand washes got it
back to something approaching its old self - which was admittedly
already old and tired.

--
Robin
reply-to address is (intended to be) valid

On 18/07/16 12:57, GB wrote:
We have a very old Kenwood mixer, with aluminium beaters. We
unfortunately put them in the dishwasher, and they are now covered in a
soft black deposit. What's the best way to get that off and if possible
restore the finish?
AlO2?
possibly strong caustic, better an acid of some sort...
vinegar/lemon juice rhubarb or maybe a de-scaler?





--
"I guess a rattlesnake ain't risponsible fer bein' a rattlesnake, but ah
puts mah heel on um jess the same if'n I catches him around mah chillun".

On 18/07/2016 13:48, The Natural Philosopher wrote:
On 18/07/16 12:57, GB wrote:
We have a very old Kenwood mixer, with aluminium beaters. We
unfortunately put them in the dishwasher, and they are now covered in a
soft black deposit. What's the best way to get that off and if possible
restore the finish?
AlO2?
possibly strong caustic, better an acid of some sort...
vinegar/lemon juice rhubarb or maybe a de-scaler?

I tried vinegar, but that had no effect.

The black stuff does come off with a scourer, but now that the original
shiny finish has gone, it discolours very easily.

GB wrote:
On 18/07/2016 13:48, The Natural Philosopher wrote:
On 18/07/16 12:57, GB wrote:
We have a very old Kenwood mixer, with aluminium beaters. We
unfortunately put them in the dishwasher, and they are now covered in a
soft black deposit. What's the best way to get that off and if possible
restore the finish?
AlO2?
possibly strong caustic, better an acid of some sort...
vinegar/lemon juice rhubarb or maybe a de-scaler?

I tried vinegar, but that had no effect.

The black stuff does come off with a scourer, but now that the original
shiny finish has gone, it discolours very easily.

Maybe time to try a spot of DIY anodising or find a firm that'll do it, or,
look out for a replacement on eBay?

Tim

--
Trolls AND TROLL FEEDERS all go in my kill file

On 7/18/2016 2:28 PM, Tim+ wrote:
GB wrote:
On 18/07/2016 13:48, The Natural Philosopher wrote:
On 18/07/16 12:57, GB wrote:
We have a very old Kenwood mixer, with aluminium beaters. We
unfortunately put them in the dishwasher, and they are now covered in a
soft black deposit. What's the best way to get that off and if possible
restore the finish?
AlO2?
possibly strong caustic, better an acid of some sort...
vinegar/lemon juice rhubarb or maybe a de-scaler?

I tried vinegar, but that had no effect.

The black stuff does come off with a scourer, but now that the original
shiny finish has gone, it discolours very easily.

Maybe time to try a spot of DIY anodising or find a firm that'll do it, or,
look out for a replacement on eBay?

Tim

Are we talking about the K beater or the whisk, I wonder?

The K beater is a casting, I'm not sure what sort of alloy. Perhaps it's
not actually aluminium.

The way to get the polish back might be to polish it with a reasonably
powerful buffing wheel and a standard polishing compound. You might be
able to use a dremel on the inside surfaces. It all depends on how
pitted the surface has become as to how long it would take.

I'm pretty sure my K beater survives a dishwasher.

On 18/07/16 14:40, newshound wrote:
On 7/18/2016 2:28 PM, Tim+ wrote:
GB wrote:
On 18/07/2016 13:48, The Natural Philosopher wrote:
On 18/07/16 12:57, GB wrote:
We have a very old Kenwood mixer, with aluminium beaters. We
unfortunately put them in the dishwasher, and they are now covered
in a
soft black deposit. What's the best way to get that off and if
possible
restore the finish?
AlO2?
possibly strong caustic, better an acid of some sort...
vinegar/lemon juice rhubarb or maybe a de-scaler?

I tried vinegar, but that had no effect.

The black stuff does come off with a scourer, but now that the original
shiny finish has gone, it discolours very easily.

Maybe time to try a spot of DIY anodising or find a firm that'll do
it, or,
look out for a replacement on eBay?

Tim

Are we talking about the K beater or the whisk, I wonder?

The K beater is a casting, I'm not sure what sort of alloy. Perhaps it's
not actually aluminium.

Mezac.

Of course. Pot metal. Zinc alloy.


The way to get the polish back might be to polish it with a reasonably
powerful buffing wheel and a standard polishing compound. You might be
able to use a dremel on the inside surfaces. It all depends on how
pitted the surface has become as to how long it would take.

I'm pretty sure my K beater survives a dishwasher.


--
€œBut what a weak barrier is truth when it stands in the way of an
hypothesis!€�

Mary Wollstonecraft

On 18/07/2016 14:40, newshound wrote:

I'm pretty sure my K beater survives a dishwasher.

Ours is nearly 40 years old. They have probably changed the coating to
make them dishwasher-safe. Ours isn't.

I've buffed it up as best I can, and we've agreed it won't go in the
dishwasher again. I was tempted to lacquer it now that it's cleanish,
but I can't find a food-safe lacquer.

GB wrote

We have a very old Kenwood mixer, with aluminium beaters.

You sure ? It would be very unusual to use aluminium
for beaters, it isnt really strong enough for that.

We unfortunately put them in the dishwasher,
and they are now covered in a soft black deposit.

I did put some aluminium saucepans thru the dishwasher
in the past and they certainly end up quite different to
the way they were before they went in, but no soft black
deposit, just removal of the anodising.

What's the best way to get that off
and if possible restore the finish?

Hard to say without it being clear what it is.

Which detergent was used ?

GB wrote
The Natural Philosopher wrote
GB wrote

We have a very old Kenwood mixer, with aluminium beaters. We
unfortunately put them in the dishwasher, and they are now covered in a
soft black deposit. What's the best way to get that off and if possible
restore the finish?

AlO2?
possibly strong caustic, better an acid of some sort...
vinegar/lemon juice rhubarb or maybe a de-scaler?

I tried vinegar, but that had no effect.

The black stuff does come off with a scourer, but now that the original
shiny finish has gone, it discolours very easily.

Yeah, once the anodising is gone the only viable approach is to get
replacements.

Should be replacements on ebay given that
the mixer itself will have died for some.