Shot-blasting is the easiest way to make it clean, but the surface will be a bit rough.
It takes some elbow grease to get is smooth (in case you want that).
Alternative it stripping paint in a chemical way or by pyrolysis.
A specialized company in Tilburg (you can go there by bike ;-) ) does this for several NL bike companies. http://www.tci-cleaning.com/algemeen_1.html
Shot-blasting is the easiest way to make it clean, but the surface will be a bit rough.
It takes some elbow grease to get is smooth (in case you want that).
Alternative it stripping paint in a chemical way or by pyrolysis.
A specialized company in Tilburg (you can go there by bike ;-) ) does this for several NL bike companies.
http://www.tci-cleaning.com/algemeen_1.html