Yup... actually kung lumamla parang di na aandar yung blades... I suggest you buy a set of silicone wiper blades (Concorde has them) and try it out... It won't be a waste since you replace wiper blades every 6-8 months anyway, tago mo nalang if that's not the culprit.

It also helps if you use a good glass cleaner often. Often means at least 1x a week especially after long trips, night driving, etc.. Bugs, sap, diesel fumes etc bonds to the glass and can be hard to remove with regular soap and water.

Give the glass cleaner a try, use it diligently for a couple of weeks and see if it improves (without changing your current wipers)... If so, then it's the glass that needs cleaning... clean your blades at least once a week as well.

If it doesn't change, then you windshield might need polishing.