I’ve looked on a few big hitters websites and the prices are very cheap imo,no wonder leaflets work,I’m tempted to get one of em to clean my house lol.
As for the brushes I’ll always give an honest opinion open forum or not,at the end of the day as long as a brush is light when you use hot water you’ve just got to get it on the glass to clean it the water does it’s job,what I don’t like is how a brush has next to no longevity to it that’s all.
I clean all types of windows new houses old houses I’m probably the best tester he’s had lol,1 row of bristles will never last long enough with cold water let alone hot.