At least once each year, the battery terminals and cable clamps should be cleaned. First, loosen the clamps so that the cables can be removed. Always start with the negative cable. Use a specialty puller for batteries with top posts, as they are cheap and available at auto parts shops. Bolted Securement of Terminal Cables on Battery Side Use a wire brush to remove all corrosion and grease from the cable clamps and battery terminals to make them shiny and clean. It is important that the inside of the clamp is completely clean as any foreign material or oxidation will prevent a proper electrical connection and disrupt starting or charging. There are special tools for cleaning available for standard and side terminal batteries. Prior to reinstalling the cables, disconnect the battery hold down clamp or strap. Next, remove the battery and check the battery tray for debris and soundness. The metal should be free of any rust, separated with a wire brush and covered with some anti-rust paint. When replacing a battery, don't overtighten the hold down clamp or strap as it could crack the battery case. After cleaning the clamps and terminals, put the cables back, ensuring the negative cable is last; do not hit the clamps. The clamps should be securely tightened, without distorting them, and grease should be applied to retard corrosion. Inspect the cables for insulation cracks or frayed ends, replacing them when required with new cables of the same length and gauge. One must take care to keep flames or sparks away from the battery as it emits an explosive hydrogen gas. The battery electrolyte is said to contain sulphuric acid. Thus, if it splashes on skin or in the eye, flush with plenty of clear water on the affected part and seek medical help if it splashes into the eye.