Do not use household drain chemicals unless the appliance manufacturer explicitly permits the exact product and procedure. A blocked household pipe and the dishwasher's internal water system are not interchangeable cleaning tasks.
Understanding this situation
Chemicals can remain in the machine, affect materials or expose someone during later service. Mixing them with detergent or other cleaners adds further risk.
A useful next step
Use the approved owner filter-care steps where safe and seek appropriate assistance beyond that boundary. Disclose any product already added before an engineer attends. Do not run hot cycles or add another chemical to neutralise an improvised treatment.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.