Neat Autosol was just causing me problems, it was making the metal more dirty than it was before - and you certainly CAN'T use it with a power tool, it burns too easily.
you can use it fine with a power tool, i have just used it on my porsche centre caps and they are even more shiny than the finish you have got, although it depends on the quality of the alloy too does the final outcome, the key is not to use too much and not to apply too much pressure