Trash can cleaning is a profitable business in the UK, as evidenced by online information and the availability of specialized rigs for sale. These rigs typically include a surface cleaner with swivel arms mounted over a wash pit with a mesh grate, a hot water skid, and a 225-gallon tank. The wash pit filters waste water, which is then pumped back to a holding tank. Homeowners are usually responsible for cleaning their trash cans, and many municipalities have trash collection services once a week. Offering trash can cleaning service on a weekly, bi-weekly, or monthly basis at $5 per cleaning for 100+ cans can provide steady income, even during slow months. For a similar concept, you can refer to services like Bin Blasters.