The best chemical to use in a cleaning gun depends on the specific cleaning task and the surfaces you are cleaning. Here are some common types of chemicals used with cleaning guns and their applications:

1. All-Purpose Cleaner: Versatile and suitable for general cleaning tasks on various surfaces such as vehicle exteriors, engines, tools, and household items.

2. Foaming Cleaner: Designed to produce foam when used with a foam cannon or foam gun attachment, ideal for cleaning vehicles as the foam helps lift dirt and grime.

3. Degreaser: Used for removing heavy grease and oil buildup from engines, machinery, and industrial equipment. Ensure the degreaser is compatible with the materials you are cleaning.

4. Interior Cleaner: Formulated specifically for cleaning car interiors, including upholstery, carpets, and dashboard surfaces. These cleaners are often pH-balanced to be gentle on interior materials.

5. Disinfectant Cleaner: Used for sanitizing surfaces to kill bacteria and viruses, commonly used in healthcare facilities, food service areas, and other environments where hygiene is critical.

6. Detailing Spray: Provides quick cleaning and a glossy finish for vehicle exteriors, suitable for light dust and fingerprint removal.

When selecting a chemical for your cleaning gun, consider the following factors:

• Compatibility: Ensure the chemical is compatible with the surfaces you are cleaning (e.g., plastic, metal, upholstery).

• Effectiveness: Choose a chemical that effectively removes dirt, grime, and contaminants from the specific surfaces you are cleaning.

• Safety: Use chemicals in well-ventilated areas and wear appropriate personal protective equipment (PPE) as recommended by the manufacturer.

• Environmental Impact: Consider environmentally friendly options if sustainability is a concern.

Always follow the manufacturer's instructions for dilution ratios and safe use of the chemical with your cleaning gun. Experimenting with different chemicals may help you find the best option for your cleaning needs and preferences.