Date: 201702
Local time of day: 1201-1800
Location: ZZZ.Airport, US
Light: Daylight
Aircraft: B737 Undifferentiated or Other Model
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Parked
Aircraft component: Rain Repellent System
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: First Officer; Pilot Not Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Human factors: Situational Awareness
Second reporter function: Pilot Flying; Captain
Anomaly: Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Illness / Injury
Detector: Person Flight Crew
When detected: Pre-flight
Result: General Physical Injury / Incapacitation
Contributing factors: Aircraft; Human Factors
Primary problem: Ambiguous

Narrative: Preflighting aircraft after it taxied in and Safety Zone was cleared for my entry. As I ducked under the nose a liquid started streaming off the side of the nose and fell onto the side of my head and then ran into my left eye. It caused a slight burning for two minutes. It had an orange smell. I ran up into the jetway and the inbound crew said it was rain repellent and they had an uncommanded discharge of it on approach; which obscured the FOs windscreen so he asked the Captain to land.I got my toiletry bag; found a custodian who directed me to a baby changing bathroom; and I removed my left contact lens and rinsed my eye under tap water for five minutes. I discarded my brand new contact lens. I called the Operations Center phone number and without knowing reached the Dispatch desk and got a General Dispatcher. They connected me with Maintenance Control who told me to rinse my eye; as a general precaution. They stated they could not find the material safety data sheet (MSDS). I asked that they text me when they found the information we needed. I didn't receive any texts.I dried my face and returned to my aircraft. I decided to get an official second opinion; so I called Chief Pilot on Call. He said he would feel better if I got checked out by EMS. Firemen came with Paramedics outside. Firemen said I should rinse. I told them I did. They said it looked good. I could leave or go in ambulance to hospital. What were they going to do besides rinse my eye? I returned to the aircraft. We had no luck searching for MSDS online but Fireman pointed out MSDS third party phone number under glass on table top. I called and they emailed me MSDS; which I need to yet analyze. I plan on seeing a doctor after I return home.First of all; inbound Crew should alert Station in range to potentially hazardous chemical. They did not. Second of all; absolute best source of guidance; MSDS; was not available to me via Maintenance Control. Third; the data shows rain repellent as Rainboe; the canister says LeBozec. I would like an MSDS mailed to my home address for that product. Maybe it's the same chemical; maybe not. How are we to know? Find out; and then let me know. I'm kind of angrier about this situation the more I write about it.


Second narrative: [Report narrative contained no additional information.]


Synopsis: B737 flight crew reported that while accomplishing the preflight some rain repellant dripped on the First Officer's face and into his eye.