Pruning can often leave your shears covered in sap from the plants, which can make your tools become sticky and less effective. A simple way to get rid of it is to simply spray a light alcohol solution on your shears and then wipe it off with a clean cloth.
Ruth Hayes, the gardening editor from Amateur Gardening, favors the method of cleaning hers with a spot of sterilizing liquid which she then wipes off with a cloth. This removes any plant sap and also sterilizes them for the next use.