Hi Fisherman,
The main points to clean are thread sections and switch contact point.
I wouldn't soak in soapy water but you could use brasso to get rid of the oxidising on the threads.
Have you seen this video:
YouTube - smokejuice's Channel
I find this technique really helps performance...
Also if you find your switch getting sticky, just squirt a touch of WD40 through the side hole on the switch thread. Then work it around a bit and you should find the action will be restored nice and smooth.
Anyway, let me know if that helps -
Cheers,
Tim