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I haven't worried about it so far, where I normally get mine there is rarely any parking past the big boulders marking the parking lot from the walkway and flower/cactus beds. I pull mine from under the cacti.
But if you are worried, why not hose it down ? You could put it in a colander add a bit of dish soap, work it in and take a hose to it for a few minutes to wash all the nasty away.
I haven't worried about it so far, where I normally get mine there is rarely any parking past the big boulders marking the parking lot from the walkway and flower/cactus beds. I pull mine from under the cacti.
But if you are worried, why not hose it down ? You could put it in a colander add a bit of dish soap, work it in and take a hose to it for a few minutes to wash all the nasty away.