If you let the water evaporate, the dirt will remain, only now it’ll be mixed with sticky soap. You can’t call your windows clean until this part is over, because they are essentially coated in dirty water. Now comes the most important part – removing the water. Tree sap is particularly tough, so if your window is under a tree or shrub, you might want to use a light scourer or something slightly more abrasive than a sponge, for example, a cloth – nothing too scratchy, though. You’ll only need to start rubbing harder if there are stubborn marks on there. Most of the time, you’ll only need a light wash over the whole pane. If you’re using a window washer (a T-shaped contraption with a sponge bar and a handle), dip it into the bucket, bring it out and squeeze excess water off it by running your finger and thumb along its length. You want your sponge to be slightly damp, not dripping wet. Now dip your sponge into the water again, bring it out and give it a really good squeeze.
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