Q: How is the oil film formed?
A:
It is formed in the following two ways :
1. The filth that trapped over the windshield surface through air contact.
2. The filth in air from other sources such as vehicle exhaust,smog from cooking,car wax residues,etc.,which are carried and spread over the windshield while wipers wiping rain.It is the filth or residue that forms the oil film.

Q:How to remove oil film thoroughly?
A:
1. Wash the windshield with clean water to remove grime,filth,ect.
2. Soak the non-woven fabric bag till the oil film remover powder inside the bag tums into paste.
3. Apply the oil film remover by rubbing the windshield in circular pathway as if applying wax. Keep rubbing about 30 seconds. If  there is liquid dispersion over windshield surface,it indicates that the wax or filth residue remains. Please rub the remover over the  surfaces again until no dispersion remains.
4. Flush away the waste frpm windshield surface with clean water. Now you can have clear vision and sight through the windshield.

Q:Way does oil film remover come in powder rather than paste from? How long is the shelf lite?
A:
1. Comparing to powder,the paste tends to be easily deteriorated and getting harden, and is hard to preserve.
2 .Practical experiments and tests prove that powder form has better cleaning effect, more pure and morehandy. The shelf life could be 2 years, if it stored under dry condition.

When your windshield wipers create band, strips, or foggy smudges pattern on your windshield, it is advised to replace your windshield wipers.