Cleaning Marble Bathrooms Soap Scum In My Marble Bathroom?

Soap scum in my marble bathroom? - cleaning marble bathrooms

I have a bath in brown marble. It's nice after the cleaning every day. I have not found a product that keeps me from daily cleaning with soap foam. I have a septic tank, so that the products have septic friendly. Please help ... Suggestions on how to keep them in good condition without daily cleaning?