Not taking clothes out of the washer right away

A big problem with washing machines is mould. Mould can lead to a foul-smelling machine, which is definitely going to shorten its life. To avoid mould, take your clean clothes out right away. Bonus points if you also leave the washer door open to allow the machine to air-dry between loads.
Here are 12 ways you’re shortening the life of your home appliances.
Drying stuff you shouldn’t be drying

If you’re planning on drying anything besides clothing, bedding, and towels, check the manufacturer’s instructions to see if you’re actually going to be harming your dryer in doing so. For example, some dryers are not meant to dry rubber, so if you’ve washed your bathroom rug (with a rubber back), don’t dry it in the dryer unless the instructions say it’s OK.
Discover nine surprising things you didn’t know your dryer could do.
Not reading and following the manufacturer’s maintenance instructions

When Consumer Reports asked laundry machine manufacturers what consumers can do to extend the life of their laundry machines, the same answer kept coming up: follow the manufacturer’s instructions for maintaining the machine. With washing machines, that almost inevitably involves cleaning the washer itself. Many modern washing machines have self-cleaning cycles.
Here are 20 ways to finish your spring cleaning jobs in 1 minute or less.