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From my understanding:
Comet=lots of icky chemicals that are not healthy
BKF= no hazardous chemicals, environmentally safe product
They are both abrasive cleaners. I personally use BKF in an effort to be greener and because my skin is very sensitive to lots of chemicals. I'm not sure where you live but I get it at Target for under $2. HTH!
They have different active ingredients. Comet's is sodium dichloro-s-triazinetrione dihydrate (which I think is the chlorine bleach?), Barkeeper's Friend's is oxalic acid, and another alternative, Bon Ami, uses sodium carbonate, calcium carbonate, and feldspar.
It says scratch-free on the package, but I personally found Comet to be "scratchier" than Bon Ami. I've never used BKF.
Both Bon Ami and Barkeeper's Friend are more environmentally friendly than Comet, but according to this article, Bon Ami is the more EF of the two: http://broomhuggers.com/2007/09/07/bar-keepers-friend-vs-bon-ami/. It also says BKF cuts grease better, but Bon Ami rinses cleaner.
Plain ol' baking soda also works well as an abrasive cleaner.
I mostly use Bar Keepers Friend because it removes rust. Comet is mostly used for it's bleaching action. I don't really buy Comet, but I have some laying around from when someone stayed with us.
I use BKF a lot more.
imo they are totally different. I find BKF to be better at getting my sink clean and I can use it on my anodized pots.
I use comet on my toilet.
We'll miss you sweet Debbie Girl (4.21.12) and sweet Cindy Girl (8.9.12)
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