Even after cleaning, sometimes behind the Diamonds especially
channel set diamonds, the crud behind them get burnt and the
black crud takes some time cleaning, whats everyone's best secret
for cleaning the burnt black crud?
I have made a wire rack that holds a beaker suspended in my
heated ultrasonic. In the beaker is a saturate solution of lye
(Red Devil drain cleaner, or sodium hydroxide). This keeps the
solution hot all the time and uses the action of the ultrasonic
to speed the cleaning process.
If you have allready soldered and the black crud is under the
diamond this may or may not help. It works excellent for a pre
clean. If you are trying to clean after you have soldered, then
you have removed (burned away) some or all of the organic
material. The organic material is what the lye attacks and you
may have some crud that the lye cannot eat.
To get a saturate solution, I fill the beaker about 2/3 full
with hot water. ( Always wearing rubber gloves and safety glasses
and being under a vent hood.) Sprinkle in the lye, the solution
will boil from the reaction, continue sprinkling , keeping the
boil at a safe level, until it no longer boils. This is a
saturate solution that will clean many grungy rings.
The chemical in lye, "sodium hydroxide", is real nasty stuff, it
reacts with water, if you get some in your eye or a strong enough
solution on your skin it reacts with the water in your body and
acts like an acid . Instant 3rd degree burns can result. I
would not suggest messing with this stuff unless you are where
you can treat it carefully and everybody around knows what it is
and what it can do. I don't mean to scare anybody off from
using it because it works great. Nothing else can come close to
it for cleaning power. Just treat it with respect like you would
a bottle of nitric acid.
Best of luck