Please choose the correct ending to complete the given sentence: Health: [header] How to keep your glasses from fogging up [title] Purchase an anti-fog product to treat your glasses at home. [step] Many companies manufacture products specifically designed to prevent glasses from fogging. These are either a spray or gel, and when applied directly to your lens, will prevent fog by forming a barrier that protects against temperature change and moisture.

Ending1: [title] Avoid over-the-counter health aids for protecting your lenses. [step] When you're using anti-fog products, read the instructions that come with the product carefully. Ending2: [substeps] If you wear glasses especially (as a general rule), apply the spray in a dome-shaped dropper enclosure. This is a good solution for preventing rain from hitting your lenses, and help prevent rain from continuing to barrel into your lenses. Ending3: [substeps] Most products require you to spray both sides of the lens, let dry, and wipe clean with a soft, dry cloth. Some products suggest longer dry times, while others require the spray or gel be rinsed off prior to wiping. Ending4: Some anti-fog products are specially formulated for use with contact lenses. [substeps] Look for a product designed to work with cloudy lenses.

Answer format: ending1/ending2/ending3/ending4