Hello this is Dr. Salama MD,
Menstrual blood itself doesn't cause an odor, it is the bacteria within the menstrual blood which causes the odor.
In fact any sort of bacterial imbalance will cause an odor.
I would look at your menstrual protection, what many women don't realize is the tampons that cause various vaginal health problems in that they encourage bacterial growth and prevent vaginal cleaning.
If you use commercial tampons these contain chemicals and bleach which affect vaginal pH - in turn affecting vaginal flora, leading to the bad odor.
If you switch to menstrual cups, softcups, cloth pads, period belts, period panties, or even sponges, cotton tampons or cotton pads, the smell during your period will be significantly reduced.
For now, you should wash daily but you only ever need to wash with water, avoid soaps, washes, sprays or wipes as they can all interfere with vaginal pH which can cause harmful bacteria to multiply leading to infections.
Keep yourself dry, wearing plain cotton underwear and avoiding synthetic or tight-fitting clothing can help keep your groin cool and dry.
Let me know if you have any other questions.
If not, please don't forget to leave a positive rating (bonus appreciated) as that's the only way I get credit for answering your question.