Well, it happened to me. I had the rather huge benefit that my engine kept running and producing power. I also had a couple inches of the left side of the windshield that were clean enough I could press my head up against the window and kinda see forward. The oil, which was pretty dirty, was thin enough to make out the shape of the runway and get aligned. Also good enough to find the taxiway. I gauged my flare out of the side window. Going into a field or a road.... that would've been real tough.
Absolutely no way to make out other traffic though, and honestly I forgot about it until ATC said they had traffic in the pattern on their radar and gave me the ctaf. Thankfully they were paying attention... one was actually ahead of me on short final and made a go around. Probably would have hit him had he landed because I was fast and landed way long.
I wish I had thought of a slip, but I'm not sure it would've helped all that much in my scenario, other than finding the airport. Maybe could've seen traffic that way too. I'm embarrassed I never thought of it, but it's a tool I seldom use in that plane, which is happy to drop like a rock when power is removed. With my luck i would've slipped the wrong direction and moved the oil over the remaining clear-ish patch.
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