Generally speaking wiper smears are caused by dirt or other contaminants collecting on the windscreen, the wipers themselves or both, so the first step would be to give the screen and the wipers a thorough clean. Use car shampoo followed by an automotive glass cleaner on the windscreen and a multi-purpose cleaner on the wipers, ensuring that all the product is removed according to the manufacturer's instructions. If this does not solve the problem you could try a dedicated windscreen water repellant, and failing that a replacement set of wiper blades should solve the issue.