Or, some might argue, a cleaner solution would be to physically separate the retail bank and investment bank - or to put it in starker terms, to break up Barclays.

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Rather than eliminate nitrogen oxide via a bulky chemical treatment system that even the EPA questioned initially, EGR would make the motor do all the work by piping exhaust gas back into the cylinders and burning it again a cleaner, cheaper, lower-maintenance solution, which would set Navistar ahead of the pack.

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His solution: a single wiper instead of two, giving the car a cleaner look.

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The solution that Apple stores recommend is iKlear, a non-toxic liquid cleaner, which its manufacturer Meridrew Enterprises says Apple uses on its own production lines.

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