"It depends" on "how long a piece of string is"! No one here can tell 
you what the risks are for your particular case. We don't know anything 
about your process. Only you can assess the risks after qualification 
tests, taking into account the end use of your products and the 
environment to which it is exposed and the hoped-for lifetime. That 
having been said, using a paste designed for easy cleaning is a first 
step towards nirvana and not cleaning no-clean paste residues is also 
quite acceptable under some conditions.

Brian

PS Sorry, my crystal ball to computer interface has packed up!

On 26/04/2012 16:40, Fabien Guizelin wrote:
> Hi,
> Can you summarize the risks linked to cleaning a non-clean paste ?
> I am concerned by incomplete cleaning of the non-clean leaving active residue on the board.
> We are using Inudium 5.1 (non-clean, Pb free), cleaned with Vigon A250.
> We are using non-clean because of experience of that paste (internally and at EMS shop) and we are cleaning to promote underfill bonding.
> Thanks,
> Fabien
>
>
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