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A pensioner was targeted by a suspected rogue trader earlier this week.
A man knocked at the woman's door in Robin Hood Lane, Walderslade, at about 12.20pm on Wednesday and offered to carry out maintenance to her property.
He is said to have demanded £3,000 in cash to clear her drains.
In efforts to persuade her, he claimed a neighbour had already agreed to have their drains cleaned and had gone to the bank to get money, but he then refused to provide details of who this was citing data protection laws.
The woman refused to hand over any money and police were called.
The man was white and of broad build around 6ft and was wearing a yellow hard hat, high visibility jacket and dark trousers.
Sgt Andy Gallon said: "This man appears to be targeting elderly people by cold calling and demanding cash up front.
"Often in these circumstances any work that is subsequently carried out is either completely unnecessary or substandard.
"Our advice remains the same for anyone dealing with cold callers. Do not deal with people who knock on your door offering work on your home or garden and if you have any concerns about their behaviour call the police."
Kent Police is reminding people to be on their guard against rogue traders who may also offer services such as cleaning driveways or roof and guttering repairs.
Call 101 to report any problems involving suspected rogue traders or call the Citizens Advice Consumer Services Consumer Direct on 03454 040506.