Dry cleaning causes so many health issues, it being caused by the use of PERC (perchloroethylene) which is a petroleum-based substance. It can have adverse effects on the human nervous system, causing headaches, breathing difficulties and memory problems. Long term exposure can cause life-threatening illnesses. It also produces toxic chemicals and waste which is having a negative impact on our environment as it cannot be easily broken down. This has been banned under environmental health in some countries due to the toxicity.