u/Plane-Masterpiece308

I have been trying window cleaning for a decent bit of time now on and off, I'm looking to take it completely seriously but my biggest issue is using squeegees, I have bought high end unger squeegee and rubber but yet it is horrible no matter what. My guess is the rubber and I would like to know what is the best rubber to buy (for residential mainly if that matters). I also was thinking about wfp system, but I do not have a van, only a car, what would be a good starer setup? All help is very much appreciated.