The answer to 'how to maintain bathroom' is to follow a regular cleaning and maintenance routine. This includes wiping down surfaces, scrubbing the toilet, and deep cleaning the shower/tub on a weekly or bi-weekly basis. You should also inspect for any leaks or damage and address issues promptly. Proper ventilation is key to prevent mold and mildew buildup.
Maintaining your bathroom will keep it looking and functioning its best. Be sure to use the right cleaning products for each surface and always wear gloves and eye protection when handling chemicals. If you encounter any major issues like plumbing problems or extensive mold, it's best to call in a professional cleaning or repair service.