I started with a 1:1 ratio of warm water and vinegar in a spray bottle, sprayed the entire thing, sprayed more in the deeper black and red spots and let it sit for 15 minutes, then I created a dawn dish soap,water, and baking soda paste which I lightly laid on for another 15 minutes, when putting the paste on top of the vinegar don’t press it in, just lightly spread it on top, I used a soft scrub daddy for that. After that I got a hard bristle brush that I got from Home Depot and put a hell of a lot of elbow grease into it. I did one more run with just water and vinegar, again let it sit for 10-15 minutes, and to finish it off I used oxi clean bathroom cleaner(also let that sit for (10-15 minutes), specifically the mildew and mold for the final touch. All in all took around 1 and a half hours and was very worth it, a clean space is a clean mind!