Zep Home Pro Mold and Mildew Stain Eraser and Cleaner 32oz

Seems like the quality of the water in your place is really hard (and of poor quality) and contributes to the forming of soap scum. The green stuff is probably what occurs over time when soap scum is not properly cleaned. I recently purchased https://www.walmart.com/ip/Zep-Home-Pro-Mold-and-Mildew-Stain-Eraser-and-Cleaner-32oz/12436456141 for removing soap scum stains in my bathrooms and it's worked really well, so far. Also, if you can, I recommend installing a whole house water softener and filtration system.