For recent paintings, your problem is more likely a build-up of dust, smoke, pet hair, dander,
and even bacterial or fungal growth. In this case, make sure none of
the paint is ready to come off the canvas or board, meaning that it
doesn't exhibit any cracks or flakes. Then you can carefully dust the
surface with a very soft, dry bristle brush, such as a baby toothbrush or shaving cream brush.
If the surface is sticky, grimy, or oily, you may want to take the cleaning a step further and actually use a mild detergent solution. Again, generally speaking, oil and water should never mix, as moisture can damage both the canvas and the impasto. Proceeding with caution, use brand new cotton cloths dipped in a mixture of dish soap and warm water. Lightly blot the surface, but don't scrub, wipe, or rub at the painting. At no point should you submerge any part of the painting, nor allow so much moisture that it drips or pools.
If the surface is sticky, grimy, or oily, you may want to take the cleaning a step further and actually use a mild detergent solution. Again, generally speaking, oil and water should never mix, as moisture can damage both the canvas and the impasto. Proceeding with caution, use brand new cotton cloths dipped in a mixture of dish soap and warm water. Lightly blot the surface, but don't scrub, wipe, or rub at the painting. At no point should you submerge any part of the painting, nor allow so much moisture that it drips or pools.
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