Cleaning apparatus comprising at least: - a holder, - a partially telescopically movable lance with a liquid distribution device, a first outer feed pipe, a first inner feed pipe, an outer return pipe, an inner return pipe, a second outer feed pipe and a second inner feed pipe, - a drive unit for translatory movement of the lance in the holder, - a first liquid-guiding system with a first inlet, a first return and at least one first flow path starting from the first inlet and leading to the first return for cooling the cleaning device, wherein a liquid can flow from the first inlet via the at least one first flow path through a cylindrical annular space, which is bounded between the first outer feed pipe and the first inner feed pipe on the one hand and the outer return pipe and the inner return pipe on the other hand, to a lance tip of the lance in which the liquid is deflectable so that the liquid enters the outer return pipe and the inner return pipe and is directed to the first return pipe, - a guide, which is provided on an end-side region of the outer return pipe opposite the first return and which positions the outer return pipe concentrically with the first inner feed pipe, wherein the outer return pipe is fixed to the first inner feed pipe by means of the guide, so that the outer return pipe is movable simultaneously with the first inner feed pipe, and wherein the second inner feed pipe is fixed to the first inner feed pipe via the outer return pipe, so that the second inner feed pipe is movable simultaneously with the first inner feed pipe, characterised in that the cleaning apparatus further comprises: - a second outer feed pipe; and - a second liquid conduit system having a second inlet and at least one second flow path starting from the second inlet through the second outer inlet pipe and the second inner inlet pipe to the liquid distribution device, wherein the second outer inlet pipe and the second inner inlet pipe are arranged within the outer return pipe. - a holder, - a partially telescopically movable lance with a liquid distribution device, a first outer feed pipe, a first inner feed pipe, an outer return pipe, an inner return pipe, a second outer feed pipe and a second inner feed pipe, - a drive unit for translatory movement of the lance in the holder, - a first liquid-guiding system with a first inlet, a first return and at least one first flow path starting from the first inlet and leading to the first return for cooling the cleaning device, wherein a liquid can flow from the first inlet via the at least one first flow path through a cylindrical annular space, which is bounded between the first outer feed pipe and the first inner feed pipe on the one hand and the outer return pipe and the inner return pipe on the other hand, to a lance tip of the lance in which the liquid is deflectable so that the liquid enters the outer return pipe and the inner return pipe and is directed to the first return pipe, - a guide, which is provided on an end-side region of the outer return pipe opposite the first return and which positions the outer return pipe concentrically with the first inner feed pipe, wherein the outer return pipe is fixed to the first inner feed pipe by means of the guide, so that the outer return pipe is movable simultaneously with the first inner feed pipe, and wherein the second inner feed pipe is fixed to the first inner feed pipe via the outer return pipe, so that the second inner feed pipe is movable simultaneously with the first inner feed pipe, characterised in that - a second outer feed pipe; and - a second liquid conduit system having a second inlet and at least one second flow path starting from the second inlet through the second outer inlet pipe and the second inner inlet pipe to the liquid distribution device, wherein the second outer inlet pipe and the second inner inlet pipe are arranged within the outer return pipe.