Final answer:
Henry likely used commercial glass cleaners consisting of alcohols and surfactants to clean the soda shop windows, ensuring a streak-free shine without salts. In place of commercial products, homemade solutions combining water and vinegar can also serve as effective glass cleaning agents.
Step-by-step explanation:
Henry likely used glass cleaners to clean the soda shop windows. These cleaners typically consist of alcohols, such as ethanol or isopropanol, combined with surfactants to break down grease, and they do not contain salts to ensure a streak-free shine after cleaning without rinsing. Additional components may include ammonia, dyes, and perfumes for a pleasant smell and enhanced cleaning power.
Alternatives for commercial glass cleaners can be homemade solutions using common household ingredients. These may include a mix of water with white vinegar or methylated spirits, providing a cost-effective and environmentally friendly glass cleaning option. For professional or at-home use, these solutions are often applied with a spray bottle, soft cloth, or lint-free duster to achieve a spotless finish on the glass surfaces.