Sentinel HX850 is an effective, ready-to-use cleaner designed to quickly remove residues and deposits from the flue gas side of heat exchangers and combustion chambers. Its formula, based on surfactants and weak acids, dissolves stubborn deposits in about 15 minutes, restoring the boiler's thermal efficiency and reducing consumption and costs. Compatible with aluminum, stainless steel, and copper, it is easy to apply, non-toxic, and allows for quick maintenance even without prior scheduling.