Summarize this article:

Fill the bottom of your tub up enough to cover your ferret’s body while leaving its head above the water. The temperature should be just slightly warmer than lukewarm. Scrub your ferret with a ferret-safe shampoo purchased from your local pet store or vet.  Never use a human shampoo or conditioner on your ferret, as these can be toxic to them. Bathing your ferret too frequently can actually remove natural oils from their skin and make their odor stronger. Unless your ferret is excessively dirty, bathing it once a month is usually sufficient and healthy. Pour a small amount of ear cleaning solution into a bowl. Dip the end of a single cotton swab into the liquid. Then, hold your ferret firmly and rub the swab along its outer ear. Move the swab deeper into the ear canal, slightly rotating it as you clean.  Ear cleaning solution is available for purchase at most pet stores. Swirling the swab around keeps you from pushing any wax deeper into the ear canal. As each swab gets dirty, replace it with a fresh one. Part of the end of the swab should always stay visible, even while you are cleaning your ferret’s inner ear. Otherwise, you risk going too deep and damaging the ear. Purchase a soft toothbrush and toothpaste designed for cats or kittens. Hold your ferret carefully in your lap and use a single hand to pull up the gums on a single side of your ferret’s mouth. Apply a pea-sized amount of toothpaste on to the brush. Place the brush against your ferret’s gums and rotate in small circles.  Your ferret may not like getting its teeth brushed at first. Try to start off slow by only doing a few teeth at a time. If you are worried about getting bitten by your ferret, talk to your vet about bringing it in for professional teeth cleanings. Once your ferret reaches its maturity, then its hormones will go into overdrive. This can result in an uptick in the odor of both males and females. Spaying or neutering can reduce your ferret’s potential marking and make them healthier overall.  Female ferrets who are not spayed can actually develop anemia over time from repeated heat cycles. Neutering a male ferret can lead to an increased risk of adrenal gland disease. Discuss the pros and cons of neutering with a veterinarian.

Summary:
Bathe your ferret once a month at most. Clean your ferret’s ears on a weekly basis. Brush your ferret’s teeth once a week. Spay or neuter your ferret at 4 months of age.