Odour is produced by bacteria digesting dead skin, oils, matter within sweat, etc., warmth and moisture promotes this activity. A very effective way to stop the odour is to kill the microbes with ordinary vinegar (wine or apple, not barley which adds its own particular odour). After washing, wipe some vinegar onto the skin where odour emerges, and wetting areas of clothing before washing at lower temperatures can also do away with the odour there although simply washing at 60 degrees works perhaps even better. The smell of (wine and apple) vinegar vanishes very quickly. The treatment is less and less necessary over time. Incidentally, vinegar is also very effective against foot odour and even helpful against dandruff and athlete's foot.