Kevin Arnott, of Warwick, launched the one-man demonstration because he was unhappy with the conditions inside a bungalow at Myton Park, which is used for separated parents to meet with their children.
He said when he visited with his daughter the building was not kept tidy and there were no locks on the girls' toilets or batteries in the fire alarms.
He added: "It stunk in there and the first thing I did was ask if I could open the windows.
"There were crayons stamped into the floor and it has been like that throughout the Christmas period.
"We went in there and it was absolute filth. I wish somebody would let me show everyone what is happening."
He also said the handles were coming off the doors and plaster was falling from the walls while he was there before Christmas.
Mr Arnott, who claims he has complained to the centre on a number of occasions, added that he was concerned for the safety of children who were using the centre on a regular basis and wanted something to be done to clean the rooms up.
The centre consists of a bungalow and a meeting room which is used regularly by children and parents.
It is run by Warwickshire County Council's social services department which claims that there are regular checks.
A social services spokesman said: "This building had two health and safety investigations last year, the latest one being in December.
"There is an on-site cleaner and we are satisfied that the building is clean and safe and we would refute any claims to the contrary."
He added that a family had used the room before Mr Arnott but the centre staff could not suggest any other reason for the problem.

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