Create a realistic car wash poster featuring two modern cars being washed under soft, natural sunlight. Use a 24-70mm f/2.8 lens with an aperture of f/4 to achieve a balanced depth of field, ensuring both the cars and colorful brushes are in sharp focus. Set the ISO to 200 and shutter speed to 1/500s to capture the dynamic action of water splashes and soap bubbles without motion blur. The cars should be positioned at an angle, showcasing their sleek designs, while colorful brushes actively scrub the cars, with soap bubbles flying around to emphasize the washing action. The background should depict a clean, modern car wash facility with large windows and eco-friendly signage, surrounded by lush greenery, reinforcing the eco-friendly theme. Utilize a soft blue and green color palette to create a calm and inviting atmosphere. At the top of the poster, include the slogan "Eco-Friendly Car Wash" in a sleek, modern font that contrasts well with the background, ensuring it is easily readable. Post-production should include vibrant color grading to enhance the blue and green tones, motion blur on the brushes for dynamic movement, and subtle light flares from the sunlight to create warmth. Add a texture overlay for a polished, professional finish.