On Fri, 17 Aug 2007 03:20:40 GMT, Ross Herbert
wrote:

SNIP
The white residue could be water soluble flux which has not been
removed after soldering the component.
http://www.kester.com/en-us/document...0(26Jan05).pdf

It seems that the brackets around the date in the link act as a
terminator to the hyperlink underlining so you will have to copy and
paste the full url to get the document.