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It's just corrosion under the paint.
The best course of action would be to strip off the paint and, as Mark says, polish it or get it repainted/powdercoated.
Aluminium alloy frames do get white powdery corrosion forming, especially if it's caused by exposure to salt. As long as the corrosion isn't too deep and there isn't a lot of pitting, then the tube strength and structure shouldn't be compromised.
The best course of action would be to strip off the paint and, as Mark says, polish it or get it repainted/powdercoated.
Aluminium alloy frames do get white powdery corrosion forming, especially if it's caused by exposure to salt. As long as the corrosion isn't too deep and there isn't a lot of pitting, then the tube strength and structure shouldn't be compromised.