Heavy soiling of porcelain stoneware tiles in the outdoor area was the problem that our colleague was called to deal with on site: The customer could not get the tiles clean, no matter what cleaning agents and methods he tried. Our colleague carried out a test cleaning with our alkaline intensive power cleaner Perfekt G 440 with our alkaline power cleaner Perfekt G 440. He used G 440 with little effort and no mechanical action and achieved a visible result. The customer was more than satisfied, as he was now able to create a gleaming exterior again with little effort and cost.