been using PIAA silicone wiper on my parent's car for more than 6 years never change, and my car for more than 3 years never change

both have 0 issue with skipping or harden, and no treatment done to the windscreen before and after install

this wiper seems to last a life time

i use super silicone series, the one that should be the cheapest and without the fancy looking arm

the thing with PIAA wiper though, if you didnt use it for a while, it wont wipe well initially, then after it run a while the blade become 'soft' again and start performing like new

and newly installed wipers need sometime for it to run-in as well, if you have access to water hose, then keep the spray running water at your windscreen and let the wiper run at low speed to high speed for few mins, make sure the windscreen is clean before doing so, or can just drive it under rain to let the wiper run-in