Stable income: Somewhat stable

Roof cleaning can be a moderately stable side hustle for many individuals. Based on online research and personal observations, some people consistently earn from this service, while others may experience fluctuations in income due to factors like weather conditions and market demand. Setting up a roof cleaning business may require an initial investment ranging from $500 to $2,000 for equipment and marketing. It typically takes about 2 weeks to start earning a profit. Overall, if your best friend were to pursue roof cleaning full-time, you might advise them that it carries some risk but could provide a decent baseline income with fluctuations. I'd rate it a 3 out of 5 because while it offers stability at times, it may not always guarantee consistent earnings like a traditional job.