There are probably better ways to do this....but this is how I have done it, and it has worked well for me.
I take an old 110 A/C to DC adapter from a toy, radio, tape player...etc.
Cut off the connector that would plug into the device, then separate the two wires.
The wire marked with a line will normally be the positive wire.
If the wires are not marked, use a volt/ohm meter to determine which wire is positive, then mark it so you know which wire is which.
Next, strip the insulation off each wire, about a half inch.
Go to Radio Shack and get some alligator clips (If you don't have any). You will need two....one for each wire.
Attach each wire to an alligator clip.
Current flows from negative to positive, so you will want to connect the negative lead to the object to be cleaned.
Connect the positive lead to a stainless steel spoon or knife. A silver rod or wire would probably work better, because the stainless steel gets pretty yucky after some use.
I have never tried to clean a large object, so normally I just find a glass bowl or container, large enough for the job.
Fill the container about 2/3's full with water, and then stir in a few tea spoons of salt, until it dissolves.
You are now ready to clean your object.
Place your object (which is connected to the negative lead), into the solution, making sure it is completely covered.
Now place the spoon/knife/rod (which is connected to the positive lead), into the solution.
Now plug the A/C adapter into an electrical outlet. After a while, you will probably notice debris flaking off your object.
That is a good sign. This means that your "electronic cleaner" is working.
Cleaning could take a few hours, to a few days.
When debris stops flaking off, you are pretty much done.
TW