A cleaning agent, preferably a dishwashing detergent, in particular an automatic dishwashing detergent, having at least one low-water, preferably substantially water-free, gel phase, which contains at least one particular non-ionic surfactant, preferably in quantities from 0.1 to 15 wt. %, from 0.5 to 10 wt. %, in particular from 0.8 to 8.5 wt. %, particularly preferably from 1 to 7 wt. %, for example from 1.0 to 4.0 wt. %, based on the total weight of the gel phase.