I am a great proponent of Magic Men's Cream Hair Remover. At Amazon, CVS, Rite Aid, etc.
I have used it for over 20 years on my entire body except my head (the big one.)
I smear it on, wait 10 minutes, shower off. If on the back, it helps if another person puts it on and, what fun, removes it in the shower.
I use it on my butt, balls, crack, etc. as well. Depending on my mood, I may use it on my chest or leave au naturel.
If first time user, try a test patch first. If you don't like the smell (only lasts a very short time) get some lavender or lemon essential oil and put a drop or 2 in a cup and mix it with the cream. Wonderful fresh smell.
The more you use it, the less the hair grows back.