Always switch off the power before carrying out any work! Spray contaminated contacts sparingly. Operate switch repeatedly. Remove dirt with blotting paper, brush or leather. In the case of stubborn dirt, repeat cleaning if necessary. Do not switch on the power again until the solvents have evaporated (after approx. 10-15 minutes). Caramba High Performance Electronics Cleaner has a resin-dissolving effect! Do not spray on winding insulations!