Maximal thermal efficiency with minimal corrosion – that is only attainable when the flue gases reach the final superheater at the temperature sweet spot. In other words: Cooling of the flue gases in the radiation passes must run constantly and in a controlled manner (see Figure 1). This is only possible when the buildups on the walls are controlled during ongoing boiler operation. Five technologies for the cleaning of radiation passes in waste incineration plants have established themselves: shower cleaning, water cannons and wall blowers, rapping systems and the shock pulse generator (SPG). In the following, we briefly explain the working principles behind these technologies.