A useful first message is short. We need the city, what you want cleaned, and a way to reach you.
Photos help a lot. For a building: the front, a sense of the height, and anything in the way, such as trees, cables, or a narrow street. For a solar plant: the rows, how large the field looks, and where a vehicle can stop.
You do not need perfect measurements. A guess of the height, or the number of panels, is enough to start. Use the quote form and we will reply with questions if something is missing.