If you use antiperspirant or deodorant,
use ones that spray or gel up through a device.
even when you think you are clean,
might be spreading body bacteria into your roll on or rub on product.
Some people add a few drops of bleach to the wash water then agitate B4 putting clothes in.
Hot water wash cleans better,
but might shrink garments.
Have you tried using a Spray and Wash lightly on your shirts prior to washing?
Considering wearing two shirts per day for less overall problem.
Drink more water,
eat less meat,
and eat healthy for better overall bo.
Rub FelsNaptha bar over your shirt,
wad or brush the suds in,
let it set a few minutes,
Convince FelsNaptha to invent a cold water laundry soap.