40 hours to fully clean this starting Wednesday at 10 am

That's mold/mildew from the shower not human waste but it looks bad hence the nsfw tag.

I have 48 hours to clean this starting Wednesday at 10 am. What's the quickest way to do this? What products should I use? Spent three days soaking my shower head in vinegar to clear mold.

Can you help me figure out how to do this?