I just can’t use rectangular brushes.
Feels like a brick. I mich prefer the supreme DuPont version.
I find it very hard to clean upstairs sills with a rectangular brush.
Also...... the DuPont bristles are fine with hot....... so far.
New brushes are coming though..... new style stocks..... new extremes. Lots of talk on the “other forum” where they talk funny and have 12 fingers.