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NuTone Vintage Door Chime Picture Gallery > NuTone LB42 Westminster 8 Note Chime > NuTone LB42 cleaning chime bores

The best way to clean the solenoid tubes is to stuff the full of paper towels and soak the towels with lighter fluid.

Use the kind of lighter fluid that goes into Zippo or other types of lighters, do not use BBQ lighter fluid or any type of solvent.

Once the goo has been softened up with the lighter fluid, use a small brush or a cloth on the end of a small diameter rod to clean inside the tube.  You must be careful not to gouge the tube when you clean it.

In the very worst cases you can use some 600 or 800 grit wet sand paper.  DO NOT USE anything sand paper less than 600 grit.  It will score the brass tubes, causing added resistance to the plungers and they will not ring properly.

After everyting has been cleaned, place the spring into the tube, followed by the plunger and the place the end cap on the tube.

The plunger should slide freely inside the tube, if it does not, it was not cleaned well enough.