Starting a window cleaning side hustle is one of the easiest ways to make extra cash. With just a squeegee, bucket, and microfiber cloths, you can start for under $150. Most beginners earn $300–$600/month, and once you have repeat clients, income can grow to $1,000–$2,000+ per month.
The best part? You’ll usually cover your startup costs after just a few jobs, making this one of the lowest-risk side hustles out there. If you want to scale, you can add services like power washing or gutter cleaning and turn it into a full business.