With kids, it's sure to become a mess, which can develop various smells in the house. Ventilation is of utmost importance to keep the house odor-free. - If your house is sunlight-facing, keep the windows open and remove curtains to let the morning sunshine in. - Change your bedsheets every 15 days or, if you wish, then 10 days. - Don't consume food in bedrooms and eat or drink only in the dining room. - Dust around your room and the entire house every 3-4 days, and you'll be surprised by how dirty things get. - Air out your comforter every 15 days in the sun to let out any smells trapped in it. - Try using a homemade air freshener. - Get houseplants to keep the air flowing. - You can also get fresh flowers every now and then if it fits your budget.