These solvents are found in common petroleum-based products such as paints, glues and rubber.
Others at risk of developing the disease are people working with petroleum, rubber and plastic.
Doctors at the Parkinson Institute in Milan studied almost 1,000 patients with the disease.
The doctors said their findings showed a need for further research.
Dr Gianni Pezzoli, of the Parkinson Institute, said the study raised serious questions.
"These findings raise serious questions about specific occupational risk.
"This study more than merits further investigation into job-related Parkinson's risk factors."
Parkinson's disease is generally regarded as a brain disorder.
It is a progressive disease which attacks the part of the brain which controls movement.
There is no cure and treatments only last a few years.
But no one has been able to find out why those cells get destroyed in the first place.