This is a very timely post, since I want to keep my 1960 Capo as original as possible, including the paint. (The 1959 Capo is a CyclArt repaint with upgraded components; it is great and stunning looking in its own right, but different from a cleaned up OEM machine.) I will have to repaint the head tube.
I have had good luck with automotive brake cleaner for general parts cleanup. I tore the wheels down to the Campag. hub shells, which took a fabulous shine after 46 years.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069