I'm using a water soluble flux when soldering headers to the Raspberry PI, apparently the flux should be washed off with water!
Is that likely to cause problems?
Update: I wouldn't solder whilst powered on, it stands to reason I wouldn't wash it with water whilst powered on.
It shouldn't be a problem, provided precautions are taken.
Make sure it is completely disconnected from everything, use de-ionised water as it is far less conductive then usual tap water, and allow it to dry somewhere warm for at least a week to be absolutely sure. While drying, pack it with silica gel or rice which will help to absorb moisture as it evaporates. The de-ionised water is more an extra precaution in case any moisture does manage to remain after this drying process.
This will invalidate the warranty and still does not guarantee success (disclaimer: don't blame me if it goes wrong) but it should significantly reduce the risk.
Please do not submerge or wash your Pi with water. This is likely to both destroy you Pi and void your warranty. I would suggest changing the flux you are using, or if you have already done so leave the residue assuming it is non conductive. Is this flux even designed for electronics?
In general water and electronics do not go well together.
