Abstract: Mobile unit for treating, cleaning, washing etc. of objects such as vehicles, aircrafts, machines, containers etc. The mobile unit comprises—transport means, —a flexible collecting pad (2) with barrier means including inflatable barrier means (4), —means (98) for supplying air for inflating said inflatable barrier means (4), —transferring means (14, 30) for fluids collected on said collecting pad 2, —a storage tank (78) for collected fluids, —a storage tank (76) for fluid, e.g. water, for washing said object, —means (90, 92) for delivering and applying said fluid, e.g. said water, wherein said flexible collecting pad (2) is stored on a separate handling device (60) that is movable in relation to said transport means.