A fairly popluar method is the to use some Garden Edging from Home Depot. $12 buys enough for two cars and it is extremely durable. I used it on my car. Did the HD lip, mud flap removal and grill block and it was all good for around 3mpg. Because the HD stuff is so cheap, it make for easy expirementation. If it doesn't work, then your out $12 and you can make it happen tonight, vs. waiting and planning and dreaming...
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