A while ago I was photographing some people surfing. I looked at some previews and was a bit puzzled: all the shots were suffering from extremely low contrast, and seemed generally out of focus.
Here's a typical shot (unedited camera jpeg):

Close up:

At this point I was wondering if my lens was broken, so I checked. Of course, the lens was completely covered in water droplets.
The shots got much better after cleaning, but just after 30s it was completely covered again.
I tried to use a hood, but it only made the whole thing more painful because I had to remove it every time to properly clean the filter.
I tried to move further away, but I was already pushing the limits of the focal length (70-300 lens, this photo is at 300mm).
Is there any technique for this kind of situation? Some sort of motorized lens wiper I could buy? :) Or would I just need a lens with a much larger focal length?
Preempting comments:
- My camera is weather sealed, and was cleaned afterwards
- This is a cheap old lens that badly needs retiring. Typical shots are not great (low contrast, purple fringing), but not this bad
- This particular shot is f/5.6, 1/500s, 160 ISO
