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My most rewarding chore is probably vacuuming. My least favorite... Is cooking considered a chore? Well, for me it is. And it's my least favorite.
I had a job doing carpet cleaning for a while. And there's actually better ways to go across carpets. I had one ex-gf complain because she would vacuum, and then i would and she could tell a difference. Same vacuum, same floor, haha.
Least favorite is anything involving strong chemicals. I am sensitive to them and have trouble breathing even just walking down an isle in the store where they are kept.