Ok this is super gross, but if it’s just a little blood, I’ve had excellent results using my own spit (before putting it in the proper wash lol)
As for deodorant, it doesn’t have to be denim, but using another fabric does work. I usually just use a sock or a towel, whatever’s handy when I notice it
I just wanted you to know how much joy the idea of cleaning stains with a hammer gives me
Imagine if it worked? So satisfying
Seriously speaking though, the only “trick” I know is to have dedicated reno clothes