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No, house cleaners or cleaning services do not need to be certified or licensed. Each state has its own requirements for licensing and certifications for companies, but most states don't require any special training to clean a home. Be sure to check our state licensing tool to review the local guidelines for house cleaners and cleaning services.

Whether or not a cleaner brings supplies also depends on their preference. Some cleaning services require the homeowner to supply cleaning products and a few basic materials (sponges, paper towels, rags, a mop, and vacuum, for example), but others bring everything they need to get in, clean, and get out.

You can always ask whether or not they bring their cleaning supplies, and if so, make sure you’re comfortable with what they use. If you prefer organic or natural products, for example, you may need to supply them or pay a premium.

No, soap scum doesn’t cause mildew, but the two substances often appear in the same spots. If soap scum is left to sit long enough and if the area stays damp, mildew and mold can grow on top of it. When these fungi combine with soap scum, your surface can become discolored, grimier, smelly, and more difficult to clean.

You should wash your sheets at least once every two weeks and as often as once every week to keep your sleeping environment healthy. If it’s hot out, or if you have a job where you might deposit dust onto your sheets from your work environment, you should wash your sheets more frequently.