If you’re having trouble reaching your upper back, get a loofah on a stick so it’s easier.
Try a loofah on a stick if you can’t reach your lower back.
Benzoyl peroxide can bleach fabric. Wear an old t-shirt to bed at night if you’re using it on your back. It may take up to 4 weeks before you start to see an improvement in your back acne from using benzoyl peroxide.