I use a lemon or apple cider vinegar, a hot towel, and then deodorant.

you need to see a doctor about this, they can give prescription strength deodorant

Spray rubbing alcohol on your pits and on the bar of deodorant, it'll help

As someone who lives in a place that reaches over 110 in the summer regularly, I have a few tips! Make sure you have antiperspirant as well as deodorant (or that your deodorant is water proof!) and the biggest tip: take a look at your clothing. If you have tight fitting clothes around the armpit so that the cloth is rubbing against the skin it can actually rub off the deodorant. Since I found this out I avoid wearing some of my shirts in the summer time. If none of that helps, speaking to a dr about prescription deodorant isn't a bad step.

You should maybe see a doctor about that.

Maybe you should get that checked out

I have the same issue, I tried all deodorant and ended up making my own out of baking soda and coconut oil until it has a similar consistently as deodorant sticks, now instead of the literal 9 times a day applying it I only have to do it once a day, every other day if I don't shower

If you are female you are so pregnant

That stinks.

Have you tried shaving them more? I have noticed my pits smell more if I do not shave often enough.