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In Reply to: RE: How do I begin to clean my 35yr old Kenwood Model 600.... posted by ABliss on April 01, 2014 at 21:10:50
for PCBs I use 99% isopropanol and a paint brush. Brush on alcohol liberally and use the bristles to apply a gentle scrubbing action I tuck a few paper towels along the bottom edge of the boards (tilting the chassis a bit) and soak up the excess. allow some time to dry, of course before turning on.
Don't use the 70% rubbing alcohol as it often contains a perfume. The 90%
alcohol found at many drug stores is ok but the additional water takes longer to dry.
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and I accidentally got some on the plexiglas or plastic gauges. The gauge faces are now slightly opaque.
a friend made up a cleaning fluid which works marvelously well, particularly if you have leaky electrolytic and oil filled caps. He mixee 409 with ammonia. Kinda strong smelling but it sure cuts through the gunk unbelievably well. I follow with the alcohol wash though.
Mix ratio? Ammonia is strong stuff.
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