The wipers on my car have been screeching since I bought it about three years ago. I put new rubbers on them a while back, but that didn’t fix it. I don’t drive in the rain frequently enough for it to be a major bother, but yesterday, I was near a Supercheap Auto, so I went and spent the money on some good quality replacement blades.
They work smoothly and perfectly. After three years of screeching, a silent wipe is almost unfathomably satisfying.
As I said in the OP, I tried that and they still screeched like a stuck pig.
I completely glossed over that! I’ve not the rubbers for sale in the UK for decades! Usually the blade supports just need a wiggle and some WD40.
The new silicone and semi-silicone blades are good, just a shame they are £30 a set.