WARRNAMBOOL welfare agencies have had to tell generous residents to ease off on donations of clothing and household items for bushfire victims.

Storage rooms are overflowing with donated items left at op shops, which came in addition to seven truckloads collected at Bunnings car park.

Some op shops put signs on their windows advising donors to bring cash rather than hard goods.

Unfortunately some donated goods will have to be discarded because they are dirty and unsuitable.

The Salvos op shop in Lava Street will convert donated goods into cash for the appeal by donating all sales income next Wednesday.

"Relief centres have been inundated with clothing and goods and they cannot handle any more," Salvation Army Warrnambool captain Gordon Main said.

"All they really need is money. People have been amazing in their generosity but unfortunately some of the donated items have not been suitable - stained pillows and unwashed used clothing for example.

"You don't want to treat these people (victims) as second class citizens. And please do not give used electrical items as they cannot be sold."

Red Cross Warrnambool volunteer Jenny Baptiste described the generosity of residents this week as overwhelming.

"We can't take any more clothing - there's just so much," she said. "It has been spilling out of donation bins onto the street."

The St Vincent de Paul Society has also joined the call for people to donate cash rather than hard items.

St Vinnies' Warrnambool op shop has trucked hundreds of items of donated clothing and household goods to a central warehouse in Rowville.

"We have been inundated with fantastic support from the Warrnambool community which is even more meaningful considering so many in the region experienced similar personal tragedy in the Ash Wednesday fires," the society said.

"The society is first and foremost seeking financial donations which are more easily distributed and are not subject to logistical complexities and distribution costs."