The bananas we buy in stores and supermarkets are genetically identical clones, all descended from one banana. These bananas are seedless and sterile; natural bananas are short, fat, and have huge seeds.
For clean fruit, fill a bowl with water (or, for bigger batches, use a clean sink), add 1 cup of vinegar, and stir. Add fruit and leave to soak for 10 minutes. The water will be dirty and the fruit will be sparkly clean with no wax or dirty film.