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Purchase an over the counter (OTC) acne cleanser that contains salicylic acid or glycolic acid. Squirt some of the cleanser into a soft bath sponge and then rub it over your back. Try to wash your back for at least a minute so the cleanser can penetrate your skin. Then rinse it off.  It's easiest to wash your back while you're in the shower. Wash your back with the cleanser twice a day unless it dries out your skin. If your skin is too dry, wash just once a day. Buy an OTC exfoliant and squirt some of it into a soft bath sponge. Massage the exfoliant into your back for at least a minute and then rinse it off. The gentle exfoliant will help to remove the blackheads on your back.  To make it easier to scrub your entire back, try using a scrubber brush that has a long handle. Many products designed to exfoliate blackheads also contain salicylic acid. Apply the cream once a day. Check retinoid cream or gel products to ensure they contain 0.1% adapalene. This will help unclog your pores so it's easier to get rid of blackheads while preventing them from forming.  If you have hard to reach blackheads, ask someone to help you spread the cream or gel for you. Rub the cream onto your back after you get out of the shower or before you go to bed. You've probably seen a lot of acne medications that contain benzoyl peroxide which reduce inflammation and treat bacteria that causes acne. Since blackheads aren't caused by bacteria and they don't cause inflammation, benzoyl peroxide won't remove your blackheads. If you have acne on your back that's causing pimples, cysts, or pustules, the benzoyl peroxide would help by removing the bacteria that's causing them. If you have a lot of blackheads that aren't responding to skin care products, talk with the dermatologist about microdermabrasion. The technician will drag a small machine over your back that sprays very tiny crystals over your skin. The machine also sucks up the crystals and dead cells from the surface of your skin. Your skin will be smoother and feel softer after the microdermabrasion.

Summary:
Wash your back with salicylic acid and glycolic acid cleansers. Scrub your back with a gentle exfoliant once or twice a week. Spread OTC retinoid cream or gel after washing your back. Avoid using products that contain benzoyl peroxide. Ask your dermatologist about microdermabrasion.