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true, I recommend cleaning them with a rag and some spray glass cleaner, first time I did I was amazed by the amount of crap on the rag tbh wipers hold a lot of grime etc.
a good clean with this method @cyclotron3k and you'll be surprised how well the wipe again (and for the next pair of wiper if you replace, it takes only a couple of minutes to do but is worth it)
Not always, sometimes they just need a good cleaning. You can inspect for wear once they are clean.