Brake fluid can strongly damage the painted surface. If it got on the painted surface, immediately remove it and carefully clear a surface.
Do not use liquid for shock-absorbers or any other liquid which contains mineral oil. Do not use a container which was used for mineral oil or water. Mineral oil will cause swelling and deformation of rubber details of a hydraulic actuator of coupling, and water when mixing with brake fluid will lower a liquid boiling point. You hold all containers for liquid the closed covers to prevent their pollution.
Do not use liquid, the cover from a container with which for the first time opened more than a year ago.