any further. continue and replace the wiper blade.
if it feels like it's just dirty, you can remove your glass goggles and a cloth and clean the blade. what we can do is to clean both blades and run them again to see how they perform.
wait too long to replace your wiper blades is not just a safety problem, because now you can't see it either, it can actually cause more damage to your car. i have seen wipers being worn so badly, to the point where the windshield needed to be replaced due to the wiper cutting the glass, and we really do not want to wait so long to 