Environmental impacts and a lack of care attack outdoor lamella surfaces visibly. Without countermeasures costs for repair or replacement may occur which can be avoided. The QLEEN lamella cleaner allows efficient and gentle cleaning of outdoor blinds, draw strings and conductor strings included, in one single working step. It has a very low weight, can be handled easily and is up to 50% faster than completely manual cleaning procedures. In combination with the Lehmann rod systems, even higher areas can be cleaned fast and safely. A use of demineralized water is recommended.