Smooth Back Skin Care Method to Prevent Back Sweat and Skin Troubles in Early Summer

As the weather gets warmer, I've started sweating frequently on my back, and I'm worried because small blemishes that I didn't usually have have appeared.

I sweat a lot when I walk around outdoors. As sweat and sebum secretion increase, the areas that touch my clothes become itchy, dead skin cells flak, and sometimes my skin becomes red and blotchy.

Are there any cleansing methods or body washes that can keep hard-to-reach areas clean?

I would like to know if there are any cosmetics, such as essences or creams, that help soothe skin troubles.

Do you happen to have any tips on how to reduce sweating on my back? As the weather gets hotter, I sweat a lot, making outdoor activities more difficult.