I had a big problem with silver fish in the areas of kitchen, hall and bathroom. Thorough cleaning and various bait boxes have been able to change anything in this state. Especially at night the colleagues were found very active and in greater numbers. About a year ago I bought Quiko Ardap Ungezieferspray and generously distributed it in all nooks and crannies. This process I reviewed a day later. The smell was gone after thorough airing within an hour. what can I say ... The stuff has absolutely convinced me! I have not seen a single silver fish and more since the first use! A new application has not been necessary. Victory all along the line and a 100% recommendation from me. 5 stars are for this great product too little!