1 Answers

Option 3 : cleaning

We cab't use 'cleaned' or 'cleans' without helping verbs in this sentence. The sentence is such that even if we used helping verbs it wouldn't make sense with these two words. The correct form is 'cleaning.' Using +ing verb here doesn't mean that the action is taking place. It implies that ''it will be painful to clean cooking vessels with carbon deposits.'' So option 3 is correct. 
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