Since it has already been soaking for a week or more...
you have nothing to lose here and if nothing else...
will wind up with a pretty chassis
I have had relatively extensive experience in
rescuing water soaked electronics over the years.
If it were mine and had been soaking in unknown
(or known) dirty water, I would do the following;
Find a basin or tub large enough to hold the unit.
(I used to have a 55 gallon drum which had
been cut-off at about 1 foot deep and the edge rerolled…
nice to work for the government... But, I digress...
a wash tub or one of the various plastic tubs you
can get for cheap at the Home Depot
should work great. You will also need;
1. Dawn dishwashing liquid.
2. Paint brushes, acid brushes,
cotton tipped swabs and anything
else you can think of to help
you scrub (gently)
3. Distilled water
(or better yet deionized water)
Enough to fill your tub twice.
4. Optionally; isopropal alcohol
(Be sure to read the caution below before using)
The best location I have found for doing this
is outdoors… backyard, patio etc. It allows you
to be as sloppy as you want without incurring
the wrath of any dwelling sharers. For the purpose
of this tutorial I will assume you are doing this outside,
if you are using the kitchen sink or a bathtub, modify as needed to
maintain harmony and tranquility.
1. Use a garden hose (or similar) to rinse off the unit.
(don’t blast so hard you remove components) just get
rid of any residue you can see on the unit. (if the
water it has been soaking in was clean, you may be
able to skip this step)(But, if it was truly in a garbage can...
I see oils and salt and other terrible things in my minds eye.
2. Put the unit in the tub with sufficient tap water to
cover it. Add approximately 2-3 drops of Dawn per
gallon of water.(it doesn’t take much and the more
detergent you use here the more difficult and time
consuming the next step will be. I’m going to
repeat this so you don’t think I misspoke …
2 – 3 DROPS of Dawn per Gallon of water!!!
3. Using soft brushes, gently scrub the entire chassis.
You are trying to remove anything that might be conductive
or might attract conductive things.( From experience I can
tell you that, in the long run, insulating oil can be just
as bad as Salt, as the oil can trap and hold
many non-insulating substances) Be gentle here, you don’t
want to rip components out or cause shorts. Once you are
sure you have gotten it clean;
4. Rinse with running water until there is no more sign
of detergent or dirt in your runoff.
Depending on the mineral content in your tap water; you
could declare yourself done at this point…
Personally, I never would.
Virtually all municipal water has been doped with chemicals
of some type. None of these chemicals can be considered
“electron friendly” and some are downright corrosive. So, the next step is;
5. If you haven’t already, dump the soapy water and rinse your
tub. Put the chassis in the tub and pour Distilled/D-Eye
water over the chassis, rinsing away the tap water. You should
be able to get this done with around a gallon or so of Dist/D-eye.
But don’t be stingy, there is no point in doing the work you’ve
already done, just to leave residue behind.
6. At this point you are probably around 99% clean. This is probably
good enough, but; if you want to be sure… the next step is to Dump
the water from your tub, Place the chassis in the tub and cover
with D-eye water, agitate the chassis for around 1 minute. Then
let it soak for around 10 minutes, agitate one more time. You can
then remove the chassis from the water and stand it on edge to drain.
7. Now for the alcohol… and a big caution here… The alcohol can dissolve
paints, lacquers and waxes. This could cause more problems than benefit.
Personally, I would skip this step. But if you think a slightly
accelerated drying time is worth the risk… then fill a spray bottle
with undiluted alcohol and mist the whole chassis until it appears
wet this will mix with the water and speed drying.
8. You can put it in an oven to accelerate drying, but; you need a
commercial style over that you can reliably hold at 100 degrees.
Melting stuff out is a very real danger; wax covered, oil filled
caps will not only loose the wax but also the oil, oil filled cans
with plastic seal could leak, many IF Xfrmrs were made with wax
impregnated wire (well, actually, the insulation was impregnated)
which held the wire in place, overheating could
cause the wire to shift... detuning your IF stages (perhaps to the
point that you can't retune them.
Much easier to just put it in the sun for a couple of days. After
it appears dry do the desiccant/Rice trick mentioned by several
folks. You can seal it in a garbage bag, cardboard box, the tub
you used to wash it in or any other appropriate sized container.
Let sit for three days to a week (or more) (BTW, the idea of
turning it over periodically is a good one.)
9. When you turn it on, use a dim bulb test or a variac and bring
it up slowly stopping at any sign of excess current draw