Milk ? Tell me about it
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We had an awful smell in the car a couple of years ago. At home, I cleaned the carpets twice to no avail. Then, one day, I thought I really must find the source of this smell. I mean, the car was new and, obviously, it wasn't there when we bought it. So I went through the inside inch by inch. Voilà. There the culprit was, jammed under the passenger seat. A burst plastic bottle of milk. How did that get there ? My wife had the answer. We'd been on a two week holiday to the Isle of Mull. Just before we boarded the ferry from Oban we went to the M&S store to get stuff to tied us over until we found a shop near where we were staying.So..what had obviously happened was that this plastic bottle of milk had rolled out of the shopping bag, which we'd put in the well of the rear nearside seat and gone under the seat and had become swollen in the heat and split.
So..yes. If you want to 'get yer own back' on someone then, if possible, pour milk on the car seat or carpet
I've heard that sugar in the petrol tank is not good either.