The rental I'm in came with my shower being covered in mold 💀 I've worked to clean a lot of it out but ofc it's in the railings

I want to do a big effort to clean it all out for good, but one thing I'm stuck on is, how do I clean the railings out? Ofc I know to scrub in there and stuff, but they're so close to the ground, and the wastewater for that has to go somewhere. Is there a tool for handling this? Should I rent/buy a wet vac? Is my best options to just layer towels on the floor and wash them in vinegar afterwards? 😭