A third deep clean has taken place since Operation Union Street Rejuvenation was launched last September.
The power-washing of pavements was being carried out by a specialist local firm and is part of an enhanced cleaning regime under the City Centre Masterplan.
The first phase of Operation Union Street Rejuvenation has included the upgrading of street furniture and the creation of a team dedicated to looking after the area.
Operation Union Street Rejuvenation is being co-led by Aberdeen Inspired, the banner under which the Aberdeen BID operates.
The next phase of the Masterplan project will focus on improving the fabric of historic buildings as part of a Conservation Area Regeneration Scheme.
The longer term Masterplan vision is for pedestrian priority between Bridge Street and the Castlegate.