We have a customer form Gurnee who brought in their Miele vacuum that smells bad and has poor pick up. We determined that these folks never changed their filters in almost 2 years!!!We presented an estimate for the work needed and got their vacuum back to working order and not stinky. When they returned to pick up their Miele vacuum cleaner, we explained the proper filter change schedule and sent them home with a working Miele vacuum cleaner.