Hi there,
Remember to do these:-
1) Wash you car clean from dirt, grease and dust free.
2) Ensure dry and cool surface of glasses.
3) Only use the rainstain remover under shade (do not use under hot sun).
4) Wear gloves, do not have direct contact of hands with the solution.
5) Use fine cloth or polishing cloth (or very fine sponge) to clean the glass surface.
6) Try out on a small portion of the glass at one time.
7) Apply a few drops onto the cloth and using circular motion, wipe on the glass surface (no need to apply pressure)
8) Make sure you do not scrub hard on the glass surface.
9) After you have cleared off the stains on your glasses, rinse your glass with water (preferably wash it with car wash cloth).
10) Then u will be able to see the before and after effect.
Point to note:
1) Its generally safe on paint surface and rubber but not advisable to use on them. If the solution is in contact with them, clean it off.
2) Do not inhale the solution.
3) Keep out of reach of children.
4) Not to be used on side mirror with anti-glare film (blueish film like on BMW, Merc, Audi, Alfa Romeo, etc)
Goodluck in the DIY process, if you have anything not sure, drop me a PM I will guide you.
Let me know the final result and see if you are satisfied with the product. If you are a happy user, pls recommend it to people you know with stains problem on their cars.
Cheers