My cleaning lady used a sponge to clean the fleishig oven.
She then use the Same sponge to clean out milchig oven.
Both ovens were cold. The fleishig oven was used in the past 24 hours and had splashing from meat that has accumulated over the year.
The Milchig oven hasn’t been used for milchig for the past month.
Is it okay to continue to use the milchig oven?
Since everything was cold, and I assume that she also used a cleaner, therefore both ovens are fine. Just make sure that the milchig oven was washed out well afterwards so that there is no residue of grease or peices in the oven. The sponge should be thrown out.