You can also get the weather conditions where on certain types of windows, after yo uhave squeegee-d the glass, the water around the edges bleeds back out onto the glass and you have to fart about with extra detailing

And it doesn't matter how much detergent you have in your water when it does happen!
However; only use the absolute minimum of detergent in your water, if you put your hand in the water and your fingers feel slippery when you rub them together then you have way too much detergent in the water.
Ian