From one of the most upvoted posts on r/Business_Ideas this year…
Currently 4% of American households have solar panels, but this is expected to rise to 18% in the next 10 years!
The business idea: it’s solar panel cleaning…
You can operate this from home, there’s already contractors available in this market, and your market cap will 4x.
Step by step 
• Open Google Maps in your neighborhood
• Find the houses with solar panels [via satellite view]
• Click on the houses with solar panels to find their addresses
• Make a google sheet of all the addresses in your area
• Create a solar panel cleaning flyer on Canva and create a door flyer Every Door Direct Mail (EDDM) campaign with USPS
• Have them send the flyers for ~$.20 ea to 100 of the addresses you found on maps…
• Create a free landing page on Carrd to point the flyers to and register inbound leads
You’d then sell those leads to local contractors 