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
Darren Osborne from Pentwyn, Cardiff was arrested by police in the early hours of Monday after allegedly ramming his van into worshipers.
A landlord has been fined at Cardiff Magistrates Court after pleading guilty to 8 charges relating to a property in Albany Road, Cardiff.
Owner Maria Caulfield, 32, was stunned when the toy from her son's bow and arrow set vanished as eight-week-old Lola played in the house.