[volt-nuts] Best cleaning procedure for precision cirquits

Chuck Harris cfharris at erols.com
Sun Sep 26 02:50:11 UTC 2010

Hi Andreas,

In my opinion, 99% (or 91%) isopropyl alcohol is the most
ideal PCB cleaning solvent available to us today.

I keep three bottles of isopropyl alcohol in my shop.
One dirty with rosin, one mostly clean, and one fresh 99%

After I assemble new boards, I soak and scrub them with the
dirty alcohol, then after shaking dry, I wash them with the
mostly clean alcohol, shake dry, and then wash with the fresh
99% alcohol.  After shaking the alcohol off, I blow dry the
boards with compressed air.

When I rework a previously built board, I use fresh 99%
alcohol for the first wash and scrub, and for the last rinse.
I always blow dry with compressed air as it blows away the
alcohol rather than letting it evaporate and leave behind
a residue.

-Chuck Harris

Andreas Jahn wrote:
> Hello all,
> currently I am soldering my first LTZ1000A reference board.
> Up to now I am cleaning my precision boards after soldering with
> denatured alcohol in a pre-washing and a main washing procedure.
> After this the last washing stage is with clean water to get rid of the
> white haze from the denatured alcohol.
> What is the best cleaning procedure? Is there one in a repair manual of
> any precision instrument?
> Which of the near best procedure can be done at a home?
> What are You doing to clean the boards?
> best regards
> Andreas

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