My uncle visited last week and saw me trying to clean the white crust off the terminals of my Toyota Fortuner with an old toothbrush and bare hands. He nearly shouted at me, and now I feel silly because I honestly had no idea there was anything risky about it. The battery is about two years old and the car sits outside all day, so the case gets very hot by afternoon. That night I looked around and found a Professional Varta battery safety guide for UAE drivers , and it talked about things I never thought of, like wearing gloves and eye protection, keeping sparks and flames away, and being careful with the disconnect order so you do not short anything. I also did not know that a hot battery can give off gas. So now I want to ask people who do this regularly. Is it okay for a beginner to clean the terminals at home, or is it smarter to let a shop do it? What do you use for the white powder, and is it harmful if it touches your skin? Which cable do you remove first, and which one goes back on first? Also, is it safe to jump start a car in this heat, or does that add more risk? If you have made a mistake while working on a battery, please share what happened so I can learn from it. Easy answers are best, I am only a beginner.

Your uncle was right to worry. The white crust can irritate your skin and eyes, so use gloves and eye protection even for a quick clean. Cleaning terminals at home is fine for a beginner if you take these basic steps.

For the white powder, mix baking soda with water and scrub gently with an old brush. It will fizz, which is normal. Wipe it clean and dry, and keep it off your skin and away from your face. If any touches you, rinse with plenty of water.

The order matters. Take off the negative cable (black, marked minus) first, then the positive. When you put them back, connect the positive first and the negative last. This stops your tool from touching metal and causing a spark while the other terminal is still connected. Turn the car off and take the key out before you start.

Batteries can give off a flammable gas, and heat makes it a little worse. Keep flames, cigarettes, and sparks away. Work in the shade or in the morning, and let a hot battery cool down before you touch it.

Jump starting is safe if you follow the right order. Connect red to the dead battery’s positive, red to the good battery’s positive, black to the good battery’s negative, and the last black clamp to bare metal on the dead car’s engine, away from the battery. Remove them in reverse order. If the battery is swollen, cracked, or leaking, don’t touch it. Call a professional.