Scrub wheels and tires using a stiff bristle brush, and a proprietary wheel-cleaning product if necessary, to remove dirt, grease and disc-brake powder.

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Heating and cooling experts say central air-conditioning systems should be serviced annually to remove dirt, change filters and check the level of Freon, a refrigerant.

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Soak them in a sink full of cold water, swish them around to loosen any dirt, remove with a slotted spoon, and drain well in a colander.

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The "toxins" turned out to be the dirt, make-up and skin oils that any cleanser would be expected to remove, she said.

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