You may clean an accessible grille only as the model's owner-care instructions allow. Do not remove fixed panels or reach past a grille into machinery or wiring.
What the observation tells you
Dust on an exterior opening is different from a blocked passage concealed behind fitted furniture. Pulling a heavy appliance out to reach it can damage flooring, cables or pipework. A vacuum nozzle can also catch loose parts if used beyond the intended surface.
A useful next step
Disconnect where the cleaning instructions require it and use the approved gentle method. Keep the opening free of stored objects afterwards. If the grille is inaccessible or the fitted arrangement seems inadequate, describe that access issue for professional assessment.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.