you really need a machine polish to get rid of them , then concentrate on good washing and drying techinque
from what i have found over the years SRP , black hole, lime prime etc only really work on very light swirls
i would invest in a polisher and some pads/polish
My Kuro is gleaming, i only really wax it now and give it a polish with my machine every 6 months using the menzerna range of polishes.