It is better not to clean the bath mat in the washing machine. Bath mats are said to harm washing machines.
Instead, the mechanic recommends taking bath mats and other heavy items of laundry to a laundromat. If you treat your washing machine with care, i.e. don't overload it and clean it regularly, you can expect it to last between five and ten years. Usually only high-quality washing machines at appropriate prices last longer - lifespans of up to 20 years can be achieved.