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Prep for final varnish
Occasionally clients do not return paintings for a final varnish within the 6 month recommendation and enough time elapses to warrant cleaning of the canvas as a first step. Usually dust is all that needs to be removed but currently I am faced with cleaning a 4 year old painting that has hung in a restaurant lounge where smoking is permitted and I am not sure what I should use that is aggressive enough to clean the painting but not risk damage. Thanks in advance for any advice.
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