Exsessive assembly cleaning

The answer to this lies within the datasheets of the components on the board. Each component has its own specs as far as number of heat cycles, time at reflow, peak temperature, whether it can be washed, etc.

You do not need to be as thorough on the passive components but many of the active and more complex components will have more stringent guidelines. If you want to be sure you are not damaging components on the board, you will want to review the BOM and check datasheets.

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100% safely? 0

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I agree with Mainteneer on this. Depending on the active components, I would check the datasheets of them. Particular groups of components to pay attention to: microphones, microprocessors, transformers, relays, switches. Washing may be in some cases forbidden, but also pay attention to the drying process. Consider baking after wash in some cases.

Any components which have poor or no sealing can be affected by the presence of water/liquid inside them. Surely the components manufacturer can advise on the cleaning process, if it is of utmost importance.

Regards, Tom

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Put together a DOE and wash assemblies until you see soldering issues on the second side?

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