You can not seem to clean it up fast enough and toxic mold keeps repelling and you wonder, when it's ever going to stop. Well, I have good news and bad news for you. Let me give you the bad news first.
The bad news is that if the mold grows behind something that you do not have access to, you could also befriend it because it will be there, until you can access the area where the mildew mold grows from. I've seen mold under floors, behind tiles, behind tubs and showers, under toilets, cabinets, sinks, mirrors, drywall, plaster, fixtures, tubs, showers and even under the paint. It does not seem like there is room in your bathroom where poisonous mold does not like growing up.
Unless you are ready to start remodeling your bathroom, the best suggestion I can give you would be to keep your bathroom as clean as possible and as dry as possible. Mold likes dark, damp areas and you may not be able to do anything against the dark areas of your bathroom, but you can keep these areas as dry as possible.
You can buy cleaners that specifically treat mold and mildew in your grocery store, hardware store or home improvement center. I can not recommend one of these products, but the regular bleach seems to work rather well.
If you have mold in your bathroom, remember that you are not the only person to have this problem and that you could fight for a long time. Now, it's time for the good news, if you have mold, it becomes moisture from somewhere and I would suggest contacting a bathroom remodeling contractor when you've finally tired of dealing with the problem.