Ordinary polish, Kiwi is great for proper grained leather, and the colour ensures the scuffs get covered up. Use a rag or duster with spit or water to rub the polish generously into the leather…it’s better than brushing it on, unless they’re welted. Make sure you get polish into all the creases, especially the ones across your toe joints, and along the rands. Make sure there’s some along any stitched seams. Once you’ve got a decent covering rubbed into the leather, use more spit/water and a small amount of polish on the cloth with two fingers behind it, rubbing reasonably gently in small circles to burnish the finish. If you want a shine, use Kiwi Parade Gloss and learn to “bull” them.
If they’re matt or napped like nubuck, you have the choice of using a suede brush to get rid of any dirt and dust, then using a proper nubuck creme, then lifting the nap again with a proper brush. Life’s too short I reckon.