Do you ride regularly? Normally, the continual flow of fuel (and the detergents in it) keeps injectors clean. Only time I have seen a whiteish build up was on something that sat for a while. My suspicion is moisture that has evaporated. The ethanol (alcohol) in fuel is hygroscopic, and will absorb a lot of moisture. Especially in a tank that has sat for a while.
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Cornerworker of the year 2012
2007 Kawasaki ZX6r "Grasshopper"
2009 KTM 400 XCW L'Autrichienne
2012 BMW R1200 GS/A "Elche"