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Co-inicidently, I was cleaning my paving with some HCL the other day - I have some left over. I will give this a go to start. Thanks Rom.
Jo, how would I go about getting aluminium cleaning acid? Is there a particular brand?
Mark, I was half contemplating getting some cerium oxide. You would probably know better than most, could you rub this on by hand without causing too much damage to the glass?
Thanks everyone.
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