I try to get any customers that are likely to be egged cleaned just before Haloween eve so that I don't have the hassle of removing the splattered eggs and eggshells.
Always carry plenty of TFR this and next week just for haloweened windows
If the windows get egged after I have cleaned them than 95% of the time the eggs are cleaned off by the customers as they can't wait 4-6wks until I'm next around