Down there and smells

Every time I have sex with my husband I have to jump up and go wash down there, if not I end up smelling so foul (tmi) but like smelly thrash and it will last for 3 days no matter how much I wash down there if I don't wash right after like I can't wait for even 5 minutes or yucky.

Does anyone else have this problem? If so help please

Even with past relationship I had this so I know it must be me.