Compatibility is accessory specific. A plain shelf, coated tray and telescopic rail assembly may have different cleaning restrictions.
What the observation means
Dishwasher detergent and prolonged exposure can affect some finishes or moving parts. A part that fits inside the dishwasher is not necessarily suitable for the programme. Check both the oven's accessory instructions and any separate rail guidance.
A useful next step
Use the approved method and allow parts to dry as required before refitting. If rails become stiff, discoloured or loose after cleaning, do not add household oil or force them. Report the accessory type and cleaning method so the next advice addresses the actual component.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.