During a period of time, dryers accumulate a lot of lint and when this lint gets in contact with the heater element which gets red hot when the dryer is working, it's when lint start burning and fire starts.

What we do for dryer inspection: ​

Remove covers of dryers, on newer models we remove console controls, remove belt of drum, clean lint, inspect all inside for burned wires or damaged parts like drum belt, rollers, pulley that connects motor with the drum. ( some times you heard a squeaking noise when using the dryer, we let you know if you need a new belt or pulley ) At the time of cleaning the vents, let us know if you need dryer cleaning and inspection and we'll do it for $95.00 and up, depends of brand, plus parts if need it ( extra charge ). If you want the inspection later or in another trip, It cost $125.00 plus parts.