Bosch for me too, there a safety critical item as far as Im concerned.

I'm just waiting for "others" to jump in and relate the story of how there wipers are a years old and have never felt the need to replace them.....

Look round car parks, often see wipers split and hanging or no blade at all, no surprise some cannot see as the windscreen never clears,(of anything)

Awful stuff that smeared constantly despite attacking the screen and blades with everything short of a flame thrower to remove it.

I guess Rain-X contains silicone. So do some Autoglym products such as Bumper Care, which users are advised to keep off glass areas.

Mixed reviews from what I'm reading. If you're a motorway warrior, they apparently promote water beading which will then follow the airflow up the screen and away. Otherwise, they can cause smearing.

Rain-X treated windscreens clear themselves at speeds of about 45 mph and above, motorway warriors should save wiper wear by using it. (I've used it for years, it also clears side windows and back window.)

Rain-X comes in two versions - the original is applied to the windscreen like polish, works very well - the other is added to the screenwash and can contaminate the level sensor if fitted - avoid it on VW Group vehicles and some others.

That does go towards explaining some of the critical stuff I’ve read about Rain-X. I’ve only ever used it once, put it on all the windows of the VW Polo saloon(!) I had at the time. I found it very effective, basically meant I didn’t have to use the wipers when driving in the rain. No smearing, the only thing was that it didn’t last very long on the windscreen.

Not really sure why I never used it again, I do remember thinking about it a few times but just never got round to it. But this was stuff which was wiped on to the glass and not added to the screenwash.