Hi.
Thanks for your query.
Noted that you have a basic problem of bad odor coming from the underside of buttocks. You have been scrubbing and cleaning twice a day.
The cause is not obviously
anal fissure or hemorrhoids as you have not given any history related to such problems hence taken for granted.
The commonest cause is overgrowth of the bacteria in the area you mentioned which produce the smell as its byproduct of
metabolism.
To eradicate the problem I would advise you the following:
Clean the area with plain water and never scrub as this causes small injuries that cause harboring of these saprophytic bacteria.
Apply liquid
povidone iodine locally 4 times a day to make the area sterile.
Oral 5 day course of an antibiotic,
metronidazole in low dosages and probiotics help to eradicate such a problem.
Keep the area ventilated as increased humidity can allow overgrowth of such bacteria.
Use loose underwear and pants.
Avoid the hot humid area and atmosphere.
Stop onions, garlic, spicy foods, meat and fish. Be a pure veggie.