Can a hand snake inspect a sewer?
No. It may reach a restriction, but it does not provide a view of the pipe or establish its condition.
Detroit, Michigan · Drain and sewer services
A practical guide for Detroit homeowners.
A small accessible blockage and a shared sewer restriction need different tools and decisions. Stop the home experiment when the symptoms extend beyond one fixture or the same problem quickly returns.

Water rising at another drain suggests a shared restriction. Running more water to test it can increase the backup. Describe which fixtures react together, so the investigation starts at a suitable point.
A short-lived improvement can mean debris remains, the wrong section was reached, or a defect is collecting material. Keep a record of the timing and any previous cleaning findings rather than repeating the same attempt indefinitely.
A buried cap, corroded fitting or unfamiliar cleanout is not a safe place to apply more force. Backed-up openings can release wastewater when loosened. Access work should be planned with the condition of the pipe in mind.
Keep people away from wastewater and avoid standing water near electrical equipment. Stop using affected fixtures where practical. If neighbors or street drains are also affected, notify the serving utility as well as arranging private drain advice.
No. It may reach a restriction, but it does not provide a view of the pipe or establish its condition.
Explain the affected fixtures, duration, recent attempts, chemicals used and whether wastewater is still entering.
Emergency Drain Cleaning in Detroit — Help for an active backup, day or night.
Call with the address, affected fixtures and any previous inspection details. The phone line is available 24/7; confirm the current service window and proposed scope on the call.