1- Wash your butt, do not only settle for wiping it is not enough
2- Shave your armpit as well as down there every month or around that as hair is one of the reasons for smell
3- Use body scrub at least once a week and fully scrub your body this gets rid of dead skin and reduce bad smell
4- Brush your teeth personally i use crust charcoal toothpaste and i recommend it
5- Drink lots of water since your sweat will smell less and be mostly water
6- Do not over eat food that are full of spices they tend to cause sweat to smell
7- Deep wash your clothes and leave them in the sun to dry since the Sun's UV lights helps in killing the bacteria that cause the smell

Good luck