I use rainx
but the problem is the smear when the wipers are used
I have honestly never ever cleaned my wipers and never had a smear....
I recon there is a slight imperfection on the wiper, it would wind me up too and I would just buy a new wiper...
they are new wipers - it was happening on the originals - so replaced them and still happening !!
so if this doesn't work.........I'll have no other choice but to scrap the car
Oh well, never liked the colour anyway
Maybe the wiper arm is bent or needs adjusting, if it is missing a bit of the windscreen no amount of cleaning is gonna make it good...