St Stephen's Care Home, in St Stephen's Terrace in Droitwich Road, was rated Requires Improvement during its latest inspection by the Care Quality Commission (CQC).
The report, published on December 9, found that 45 patients, both young and old, could be at risk of infection.
Worcester News contacted St Stephen's Care Home for a comment but it did not respond to requests.
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The CQC inspectors said: "We found significant shortfalls in the environment, which was not always safe, and risks were identified in infection prevention and control (IPC), medicines, clinical documentation, and oral care.
"We asked which areas had already been cleaned, some of which were still extremely dirty with a risk to people of cross infection."
On the first inspection day, the assessor found dried faeces stains on bedding, doors, and in one room on a sealed catheter bag.
In another case, one person's toilet was broken and remained unfixed two months after it was reported.
Most clinical waste bins were also broken.
"The environment in which people were provided with care was neither safe nor clean," said the report.
"We reported this to the provider, who addressed some of our concerns.
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"On the second day of our assessment, we saw the premises was cleaner."
The care home's Infection Prevention and Control (IPC) audits were also found to be "ineffective" because none of the CQC concerns were addressed.
Some Control of Substances Hazardous to Health (COSHH) products were also not locked away, and certain creams remained unlocked during the visit despite the CQC raising concerns.
Overall, the service scored 59 out of 100 for safety.
In the overall outlook of its inspection, the report said generally, people spoke positively about the service and described staff as helpful, friendly and compassionate.
But, some people told them they needed to wait for staff assistance.
It also observed that staff did not always respect people's dignity when interacting with them, which required further improvement.
The CQC also rated the home good in the responsive, caring, and effective categories.