The whole notion of "no-clean" fluxes is that you do not need to clean
them: it's as simple as that. IPA is not, in any case, a good solvent
for flux residues. The combination you state will almost inevitably
produce the results you observe. If you think you need to clean after
hand soldering, the first question to ask is, "Why clean?" (
http://www.protonique.com/plcom/files/whycl.htm ). If you then decide
you must clean, you must then examine the flux and cleaning chemistry
and processes as an ensemble and not as four separate items, to put the
best chances on your side.

Brian

"Karnwal, Pankaj" wrote:
>
> Dear all
>
> Some time we are facing a problem after hand soldering .
>
>      After wave solder soldering we puts some components like transformer,
> connectors etc. ( Due to shortage of the components ) . We use the no clean
> solder wire for hand soldering ,after soldering we observe that a
> transparent flux residue appeared around the soldered lead and if we try to
> clean it by IPA (ISO PROPYLE ALCOHALE) after drying, It will change in to
> white residue and create bigger problem.After cleaning all,  the surface of
> PCB and solder joints get dull shining.
> Pls. suggest the better way to clean
> Thanks
>
> With regards
> Pankaj Karnwal
> Quality  Assurance
> BESL     NOIDA   (INDIA)
> PH .91-120-4420394-5 EXTN.211
> e mail : <mailto:[log in to unmask]>
> Barco, innovators in image processing
>
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