At a previous company I had all sorts of problems with Senju Sparkle print solder paste,
brilliant for printing and pin testing residues but if a misprinted board was left for a while
before cleaning it went rock solid. The only stuff I found to remove this paste was Alpha
Metals Autoclean 40 in an old Dage Turbowash. All the flux was removed and any final solder
balls which were caught in between the pad and the solder mask were removed with a brush.

Good luck.

Steve Brown.

Tony Conlon wrote:

> Morning folks,
>                             Here's a brief summary of the situation: Boards
> exiting the screen printer and found to be mis-printed ... we are manually
> cleaning at the moment (AlphaMetals Screenwash & Lint-free cloths) ... it
> works but not consistant ... thus auditors etc ... would not be particulary
> impressed. Due to certain issues we have decided that we cannot clean
> boards for a particular customer ... they have to be scrapped. Big problem!
>
> In the past we have tried the old 'Kerry stencil cleaner' (operates by
> means of a rotating arm dispensing the cleaner approx 20min cycle) as a
> board cleaner ... with Vigon SC200 solution: The result ... ok ... but we
> have gold contact-fingers to contend with and the paste seems to lodge at
> the fingers edge and the rest ...
> We also tried the newer 'Kerry' machine (Ultra-sonic based) ... not
> successful either I'm afraid.
>
> We have also tried a Branson Ultrasonic cleaner (with Vigon & Clean-thru)
> approx 30min cycle ... same story as above.
>
> Right guys! Any super-duper cleaning equipment/solution spring to mind? The
> gold contact-fingers are really making life difficult.
>
> Cheers guys,
>
> Tony.
>
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