Towards the end of the movie when Danny has just seen Sandy dressed in black and so on, they launch into "the one that I want". Notice that the first time he falls to the ground his tee shirt gets dirty. However the next shot of Danny shows his tee shirt to be perfectly clean!
Look closely, its still dirty. The sun is just shining on it.
It doesn't become clean again until they're driving away into the sky. And thats probably because after all that dancing & rubbing of his chest it has dusted away.
Actually, you're wrong. Danny's shirt is still dirty. You can see after he gets up, there is a foot print on his shirt from where Sandy taps him with her foot for him to get up.
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