Here's the MSDS for Rain Away a RainX like product. Rain Away has a Mil Spec and Rain X doesn't. While RainX might work ok for plexi and lexan AC windows the manufacture doesn't recommend it, where as RainAway does.
http://www.shop.edirectory.co.uk/auto_u ... 8&cid=1270
Brand Information
Brand Name: Rain Away Rain Repellent
Form: liquid
Product Category: Auto products >> Windows/Windshield >> water repellent
Customer Service No.: 800-528-0334
Date Entered: 2003-11-13
Related Items: Products with similar usage in this database
Manufacturer
Manufacturer: Kafko International, Ltd.
Address: 3555 W. Howard Street
City: Skokie
State: IL
Zip Code: 60076
Telephone Number: 847-763-0333
Fax Number: 847-763-0334
Toll Free Number: 800-528-0334
Date Info Verified: 2003-11-13
Related Items: Products by this manufacturer
Health Effects
The following information (Health Effects, Handling/Disposal, and Ingredients) is taken from the product label and/or the Material Safety Data Sheet (MSDS) prepared by the manufacturer. The National Library of Medicine does not evaluate information from the product label or the Material Safety Data Sheet.
Acute Health Effects: From MSDS
HEALTH HAZARD DATA
Effects Of Overexposure
Contact with eyes will cause irritation. Prolonged contact with skin may cause drying. Excessive inhalation of vapors can cause nasal irritation, dizziness, weakness, nausea, headache and a
narcotic reaction. If swallowed, may cause stomach cramps, nausea, vomiting and/or diarrhea.
Chronic Health Effects: MSDS:
Prolonged contact with skin may cause drying. Excessive inhalation of vapors can cause nasal irritation, dizziness, weakness, nausea, headache and a
narcotic reaction. [Oh boy!

]
Carcinogenicity: MSDS:
No information provided.
First Aid: For eye contact, flush with copious amounts of water. For prolonged skin contact, wash with soap and water and apply skin cream/lubricating ointment. For inhalation, remove to fresh air. If swallowed, drink water and induce vomiting. For any emergency, obtain medical attention. Clothing soaked with product should be changed immediately.
Health Rating: N
Flammability Rating: N
Reactivity Rating: N
HMIS Rating Scale: 0 = Minimal; 1 = Slight; 2 = Moderate; 3 = Serious; 4 = Severe;
N = No information provided by manufacturer; * = Chronic Health Hazard
MSDS Date: 2001-08-01
Handling/Disposal
Handling: MSDS:
Store in well ventilated areas at temperatures below 120ºF and away from any ignition source. Since emptied containers may retain product residues (vapor, liquid and/or solid), all hazard precautions given in this data sheet must be observed.
Disposal: MSDS:
All Local, State And Federal Regulations Concerning Health And Pollution Should Be Reviewed To Determine Approved Disposal Procedures.
Ingredients from MSDS/Label
Chemical CAS No / Unique ID Percent
Isopropanol 000067-63-0 >90
Sulfuric acid 007664-93-9 <1