Sue’s 2020 season

Well, i’m getting serious now - does anyone know how to kindly oust a rooster?  I know my rooster is nothing to do with the pair that are interested in my box.  Female is still cleaning poo but her visits have dropped off and at best she just pops in once or twice a day.  She doesn’t stay and she is not bringing in any more material.  I really am thinking that the rooster and his continuous poo is beginning to put them off. HELP.  Has anyone else got a rooster that is nothing to do with nesting?  I know I have to leave nature alone but am really getting desperate.  Can I put up a ‘let’ sign or something  .  Feeling like my optimism for a nest is draining.
Sue