I use Belgom Alu on mine too - the bumpf says: Belgom Alu cleans and protects.
It is a very fine metal polish suitable for aluminium and its alloys, brass, copper, nickel and chrome. Where Belgom Alu differs from other metal polishes is that it contains a waxed additive that protects and seals the polished metal for several weeks. Use Belgom Alu for a shine that lasts weeks and weeks
It does seem to work quite well, although I'm no expert on these things!