after washing with EtOH, did you calcine the film at higher temperature of 550 C? this is how we remove the MB of thin films... I hope this can work

Thank you, Ikram Rana.

I thought about washing the film with ethanol. I want to clean the film without affecting the structure of the film.

I understand, we coat a film and then check the quality of the film using MB. after removal of MB, we didn't see any negative effect on the film. but of course, application and synthesis parameters may vary.