“I CAN do it in half a day.”

That’s the claim of Huddersfield restoration expert Charlie Cartwright, who has offered to use special equipment to clean the cascade in St George’s Square.

It also emerged yesterday that there is no warranty for the £230,000 water feature.

The cascade – which was a centrepiece of the £4m revamp of the square – has been out of action since one of its pumps broke down a month ago.

Kirklees Council had planned to clean the white stains off the black granite cascade while repairs were taking place.

But the marks remained on after workers sprayed them with water jets.

And now Mr Cartwright, 49, has offered to remove the stains within half a day – in return for a small contribution to Kirkwood Hospice.

The Kirkheaton man said: “I’ve had a look at the cascade and I don’t think it would be any problem to clean it.

“The stains are probably caused by mineral deposits because the cascade has had washing-up liquid put in it, there’s been frost, there’s been all sorts.

“It’s the sort of job I’ve done before, I think it would take two of us about half a day to do it.”

Mr Cartwright’s company CC Surface Restorers specialises in refurbishing heritage sites.

He believes he could clean the cascade using the Farrow System, a cutting-edge device which uses concentrated heat to remove stains without damaging stonework.

Mr Cartwright, who has done work for Kirklees before, emailed the council on July 23 offering his services but is yet to receive a response.

He said: “How long is this going to take? The cascade is supposed to be the centrepiece of the square redevelopment yet I’ve heard nothing from Kirklees.

“I’m dismayed because I’m registered with the council.”

Mr Cartwright added that he would do the job for free if Kirklees agreed to make a £300 donation to Kirkwood Hospice.

Yesterday a council spokesman said that Kirklees might take up Mr Cartwright’s offer.

He said: “We are meeting this week with the fountain manufacturer to discuss the best way forward.

“We are familiar with Mr Cartwright’s work and his way of cleaning the cascade is one of the options that will be looked at during the meeting.

“The council has contacted Mr Cartwright and we thank him for getting touch. We will, of course, be keeping him up to date on the situation.”

The cascade was a key part of the £4m redevelopment of St George’s Square which was completed last October. The work finished a year behind schedule after contractor Wrekin went bust.

And a council spokesman revealed this meant there was no warranty for the broken water feature.

He said: “There is no warranty as the work was carried out by subcontractors after the council had to step in when Wrekin collapsed, but we are in talks with the equipment suppliers over the faulty pump.

“The main contractor is a firm called the Fountains Company and they are assisting with both the cleaning work and replacing the pump.”

Mr Cartwright has helped clean up many sites. In November, 2007, he removed graffiti from the stone walls of St Augustine’s Church in Scissett.

The following month he cleaned the statue of Billy Bremner outside Elland Road after it was defaced by Huddersfield Town fans.

Two years later he helped improve Almondbury Conservative Club by removing 20 layers of paint from the 17th Century building.