Only removing male flowers is enough. You don't need to remove seeds or wash the plant. She's already pollinated and will give some seeds, yes. Let her do. Its not a freaking thing to have some seeds. Just will lower the yield a little bit which is already happened. Stressing the plant by removing the seeds earlier or washing her can lower the yield more than seed I think. I'm not an expert on those. Maybe look for a better advice on forum or google.