Cambridge City Council Graffiti Removal Targets

According to their website, the Cambridge City Council aims to remove all graffiti 'at source' [sic]. Presumably this is just a staging post, and the ultimate solution will be to remove it remotely, from the comfort of their Guildhall offices.
Offending graffiti will be removed within one day, which is strange, because illegally parked vehicles blocking bicycle lanes take at least a week.
Graffiti that doesn't offend will take up to five days. I don't see how that works, because you can't say anything these days without offending someone, even if the information is factual, such as 'Starbucks coffee sucks'.