I got hold of some Autosmart G101 today from the local rep and set about doing my first ever engine detail. I was quite pleased with the results overall (I didnt realise the Audi rings were silver?) however I was wondering if there was any way to clean up the rusty thing which can be seen bottom left corner? I didnt want to muck about with it too much as I didnt know what it was, in fact I was even a bit wary using the pressure washer on the engine bay so decided to use a slow running hose instead Can it be cleaned and if so what with and how? Many thanks in advance.