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I'm a bit sketchy on this but from memory there will always be water in the exhaust of a petrol car anyway, as the engine warms up it turns to steam and exits the back as it's one of the byproducts of burning petrol and the main reason the exhaust rusts from the inside out.
If you google 'how stuff works' you should be able to find an explanation for this along with loads of other things you didn't realise you wanted to know.
In short, if you're not losing water and it's not becoming contaminated don't worry about it.
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