As for most of us, yesterday was very hot and dry, so I was surprised to notice a wet patch in the front garden, almost but not quite, a puddle. This was about 5pm. It had a bit of an oily glaze to it, and was about the area of a plastic bag. The leaves on the side of the privet hedge near the patch were also visible wet. The liquid was odourless and tasteless, but felt a bit oily.
Can anyone explain what this was?