Spring clean

Hi All

Cleaned my bike today for the first time in a while.

I have not used it much over the last 6 weeks so i thought i would give it a quick wipe over, on closer inspection i was shocked how dirty it was and that some of the bolts ect had started to get a white residue on them i assum this is the start of corrosion?

Anyway cutting a long story short i got the hump and have stripped the bike complete. I now have it in bits in my garage ready for a proper clean

What i wanted to know is the best thing to use to clean or get rid of this residue thats on the bolts and radiator ? Now i have all the bits to hand it should be easy enough to do a proper job

Thanks