painting cleaning?

Hi group, what can I use to clean a old oil painting I have on the wall, without damaging it?
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Fresh slices of a soft, doughy kind of white bread, with the crust removed. Scrub the painting gently with the bread. Change slices as it gets dirty or starts to fall apart. Use a very soft paintbrush to remove any snagged crumbs.
That tip originally came from a museum curator.
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jamie ( snipped-for-privacy@newsguy.com)

"There's a seeker born every minute."
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if it has any value then see a specialist
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