It's crucial for parts to be quite dry *before* soldering - otherwise the rapid boiling of trapped moisture can cause components to crack. *After* soldering, it's much less of an issue. Many components can be washed with water and detergent, no problem. Most resistors, ceramic caps and tantalum caps should be fine. Wire wound components (inductors, transformers) may be a problem as there's lots of gaps for moisture to get in. Aluminium caps often come in washable and unwashable versions - it may be worth paying a little more for washable. If you do wash with water it's probably a good idea to follow up with a wash in alcohol - the alcohol displaces the water and then evaporates better. Isopropol alcohol is good, methylated spirits is probably OK. Finally, a good dry is needed before powering up. Regarding de-ionised water: it's cheaper than distilled water and not as pure, you can use distilled water in its place. Depending on where you live, tap water may be fine or not fine - the mineral content varies hugely from location to location.
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