Only follow the temperature conditions specified by both the appliance and cleaner instructions. Many cleaning products require a cool surface and must not be sprayed around hot parts.
What the observation means
Heat can change how a chemical behaves and increase exposure to fumes. A warm cavity also makes it harder to keep product away from seals, vents and sensitive finishes. A product intended for a removable tray is not automatically approved for every internal surface.
A useful next step
Let the appliance reach the required safe condition before cleaning. If fumes or an adverse reaction appear, stop and follow the product's safety advice. Do not heat the oven deliberately to burn chemical residue away.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.