Robert E. Bailey, of Cumberland, R.I., pleaded guilty on Monday to open and gross conduct for being naked at Economy Car Wash in North Attleborough on May 31.
The Sun Chronicle reports that a woman vacuuming her vehicle at the business called police after she saw the 65-year-old Bailey in the nude.
Police say Bailey was wearing shorts by the time they arrived at the scene and denied doing anything wrong.
A judge also ordered Bailey to stay away from the car wash and the witness and to continue counseling. He will also be required to register as a sex offender.