Hi,
My left hand drive 1960 Plus 4 regularly develops a small patch of oily deposit on the inside of the windscreen. It accumulates as a light smear right in my line of vision, just about four inches square, but annoying. It is almost lined up with the bonnet louvres, but not quite, and is on the inside. Any suggestions as to where this might be coming from or how it can be getting there? Beats me! Thanks.