Recommendation: Since there may be some differences in the use of glass cleaning products, we strongly recommend that you read the enclosed instructions before starting work.
The standard glass cleaning procedure is as follows.
1. Spray a special agent onto the glass.

2. Wipe the glass dry with a soft cloth or paper napkin until the streaks disappear.

[Original source is on the website: OpelBook]
We wash the rest of the windows in the same way, both outside and inside.

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