I swear by Simple Green. Let it sit a bit, then scrub gently with a scotch-brite type pad. It is a great de-greaser.

Magic Eraser works wonders!

I use 50/50 vinegar and hot water, spray it on, let it sit a minute, and scrub with a blue ScotchBrite sponge (the blue ones are scratch-safe and can be used on teflon, enamel, etc.) -- I use this for everything, including grease on my range hood and stove.

Spray-type oven cleaner. The nasty, smelly stuff.

Spray on warm dish, leave for a few hours, rinse and scrub.

Use caution with the cleaner, it is rough on skin and eyes.

I would stay away from aggressive abrasives on a piece like you describe, there is a chance of scratching the finish. Best to chemically soften the deposits first.

Or you could do like I did and drop/shatter your Emile Henry piece on a tile floor and go get a new one. It was a painful experience and expensive but the new piece was clean!

I would fill a large pan with hot water, dish soap and plenty of white vinegar and let the ceramic dish sit in it overnight.

I removed about 50 years worth of accumulated grease from behind a stove in a rental unit using the mixture above. I just sprayed it on and let it sit.

Goo Gone?

If you have a self-cleaning oven, you can leave the dish in the oven during the cleaning cycle. Just make sure to leave the dish in the oven until it is cool to the touch.

This works great for dishes that have deep stains that have seeped into the ceramic. It will also work for backing pans that have multiple years of baking stains.

I have an Emile Henry Lasagna dish in blue and I use one of those green scotch pads and regular dish soap. Works great without too much elbow grease. I thought I would be scratching the finish, but I use my baking dish all the time and it seems fine.

This is a bizarre hint that I picked up somewhere, but it has worked for me. Place the dish in a large bucket, sink, or baking dish in which it can be fully submerged. Add hot water and a fabric softener dryer sheet and allow it to soak overnight. You should then be able to rub off the grease with the dryer sheet. I have had luck with this on Pyrex bakewear.

Put the dish in a plastic bag, pour in some ammonia, a cupful or so, seal and let set overnight in the sink or outside. Throw away the bag, scrub your dish with hot soapy water, you usually don't even need a scrubbee. It really works, and is much safer than oven cleaner.

Something acidic (lemon, orange, vinegar, etc.) and a lot of elbow grease seem to do the trick for me. I end up with a sticky greasy residue on baking sheets and ceramic bakers all the time, and this works wonders for me.

Just scrub with an sos pad. Of course if you are using bar keepers friend I'm guessing you don't like chemicals. So just do it this once and make sure to soak after use

Thanks for all the suggestions! I really appreciate the help! -Kate