can i ask something ,

nowadays keep raining , so after rain , the widshield glass seems very blur , got some sort of mark left by wiper , i wonder how to get rid of those mark , althought i always wash my windshield ??

especially after rain , where the weather is still cold , air is on , the mark is more obvious ?

do normal winshield cleaner can solve that , and i found out even worst to use rain guard , after sometime where the rain guard fade , leaving much mark on the winshield