Things they Should Invent: opt-in window washing

Washing windows is hard, and if you're not good at it (like me), it isn't particularly effective because you leave streaks everywhere.

Every building I've lived in has hired professional window-washers to do the non-accessible windows, but has left the tenants to their own devices for windows on balconies (presumably because window-washing is expensive). But I've always had balconies (#FirstWorldProblems), so I've always been stuck making my windows streaky.

what landlords should do is give tenants the option to pay some money and have their balcony windows washed when the professional window washers are there. Then people who want their windows washed professionally can get it done, and people who'd rather do it themselves don't have to pay the money.