South Wales Police say anyone caught spraying or writing graffiti "will be dealt with efficiently and appropriately".
Over the last two or three months, the tag SPEC has been sprayed on property across Ely and Canton.
This was a concern to the community and we are glad that the person responsible has apologised and agreed to clean up the damage.
Graffiti is criminal damage, which can affect quality of life, increase fear of crime in some areas and reduce pride in a community. This will not be tolerated.
More top news
Temperatures will tumble under clear skies tonight with a widespread frost developing.
Police found more than 20 cannabis plants, a small amount of cocaine and a prohibited stun-gun at the home of Richard Williams.
Finance Secretary Mark Drakeford and his Scottish and Northern Irish counterparts demand no further public spending cuts in the UK Budget.