Other contributors have said "Is sweat corn sweat?" is the same question as "Is sweet corn sweet?" If you believe that these are not asking the same thing and should be answered differently, click here
Corn starts to lose freshness very quickly. Sugars in the corn start turning to starch within hours of picking and can sour/ferment in warm conditions within 24/36 hours. Even in cool conditions...
I'd say it is. Repetition is something (an idea, a word, a phrase etc. etc.) which is REPEATED for effect. Here, the word 'sweet' is repeated. It is done for effect. Hank Williams in one of his songs...
To clean sweet corn you simply peal back the outside shuck and remove all of the silks. Once your corn is clean you can boil it to eat fresh or freeze.
If you are freezing your corn you will want to...