Need help from the most experienced pros.. We have two brand new cars, a civic and a city.. after getting some good news about rainx i tried using it for almost three weeks. Now, its darkside is showing up.. whenever it rains, my wiper started skipping and making those iritating jigjigjigjig sounds [copied the sound fx ].. even if the winshield is newly washed/cleaned, still nagskip parin.. i tried cleaning the glass with car shampoo and even dish washing liquid and then hosing it with water while the wiper is on but STILL.. nandun parin si jigjigjigjig.. kakairita grabe! Need advice please..

And also, I tried vinegar.. dilluted/not dilluted.. nandun parin.. tried new wipers.. nandun parin.. help, help, help..