Other than being really gross, not cleaning your bathroom can pose many potential health risks to you and those who use it. Bathrooms are a high-humidity zone where microorganisms thrive. Mold, mildew, yeast, and bacteria can build up quickly on your bathroom’s surfaces, causing respiratory issues, skin irritation, and illness.

As a general rule, you should clean your oven at least every three months, though this depends on how often you use it and the amount of residue buildup. A clear sign that your oven needs cleaning is if you notice smoke or a burning smell during use. Many ovens have a self-cleaning cycle, which heats the oven to an extreme temperature. If you use this feature, stay home while it runs and consider ventilating the room, as it can create smoke. For manual cleaning, you can make a paste of baking soda and water or use white vinegar before resorting to harsher, store-bought oven cleaners.

Clutter and disorganization can make even a clean house seem dirty. Decluttering unused items will make your home seem cleaner, and putting storage solutions into place will give a house a more organized look and feel. Other things that can make a house feel dirty include stained or faded carpets and upholstery, dirty or dingy walls, chipped paint, and disorganized shelves.

Whether you’re a renter or a buyer, you should clean a house when moving out. For renters, it’s usually written in the lease that a house must be cleaned before it’s vacated. If you’re unsure how thoroughly to clean the place, check with the landlord beforehand; otherwise, you may not receive your deposit back. When selling a house, a contractual agreement is often made with the realtor that the house is swept and that all personal belongings are removed before the previous owners move out.