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I have been meaning to ask this question, but always seem to forget. When the Prostocks cars leave the line their are 2 NHRA officials in each lane either wiping or placing something on the track.
Can anyone please tell what they are doing?

Thanks in advance
 

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they may be wiping up water/fuel or wiping a rosin bag down against the surface. after they are done, if you see kind of like a goldish/yellow/creme colored spot in where they wiped. its rosin.
 
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