My cleaning lady put the oven racks of the milchig oven into the fleishig oven.
My mother, not aware of this, preheated the fleishig oven.
When it was 275 degrees she realized that the milchig racks were in there. She took them out then.
What’s the status of the racks?
The racks are still fine to use for milchig. The reason being that we are not afraid that any steam or fleishig of the oven walls went into the rack. Therefore the rack remains milchig.