Cleaner with an adhesion-promoting effect for ARA^® sealants and adhesives on non-absorbent substrates. Optimization of adhesion between sealant or adhesive and substrate. Accelerated build-up of adhesion ARA^® Haftreiniger 1200 improves the adhesion in many cases with regard to the strength and durability of the connection. Furthermore, the speed at which adhesion builds up between the sealant and the substrate is also increased.