High solvency power in flux residues and pcb contamination of all kinds practical brush spray nozzle for dosing brushing rinsing dries fast and residue free kontakt lr is a cleaning agent specially designed for the electronic flux the flux material and solder beads stuck on integrated brush spray can be removed safely the cleaner leaves no residue and gives a flawless professional look to the circuit boards applicationcleaning circuit boards and other electronic components after solde