Don't worry, if you have soapstone, then it can't be ruined by any chemicals.

If you used a concentrated Mr. Clean, I would guess that you stripped off a lot of the previous patina from 2 months of oiling it. You may have to oil a few times to get the same amount of darkening that you had before. I dripped Goof Off all over one time and it took several oilings to really darken the areas to the same color as the rest of the counter. If you washed with soapy water in between the oilings, you may have removed even more oil. For the most part, I have found that washing the soapstone with just hot water and a microfiber cloth maintains the color by not removing any oil from the surface. I would recommend oiling it a few times without using any cleaners in between to see if you can get back to the same level of oxidation that you had before.

Did you happen to sand it out? I have read that sanding can also change the tendency to have white spots if you use a different grit than the installer used. My installer told me to use 220 grit to sand it out.

We have Black Venata from M. Tex, too. We've never had a problem with watermarks, but I pretty much just use hot water and a microfiber cloth like cleo2007. Also I use a mineral oil/beeswax mixture. Pluckymama had a horrible time with watermarks and her counters have been doing much better with Dorado's drywax. Here's a link to another thread I had on watermarks, etc.

Thanks for your replies, cleo 2007 and laxsupermom! I think what I did just took the soapstone back to its original gray color. I've oiled it twice now, and the marks from the water don't show up nearly as much as they did before. I think with more oilings it'll get back to it's darkened state.
I have a question for you, laxsupermom. Have you sanded any dings in your soapstone? We had one on an edge that I tried different grits (100, 220, even 400) of sandpaper on, but all left fine sanding lines. Have you seen that with your black venata? It's not really a big issue to me, but I was just wondering since you have the exact variety we have.
Have a great day!!

I did have to sand a ding. I think I used a 220. I wrapped a block with it because I find that sanding works better as I don't get lines when I use a block vs hand pressure(this holds true for sanding wood, too.)

I would like to take my soapstone back to its original, medium gray. I haven't oiled in over a year and the surface is very uneven...water rings, and very dark areas which are used the most. Would Mr. Clean do the trick?

Help! We just had our Soapstone installed 2 days ago from M.Teixera and they left it oiled. I just cleaned it with water and some soap and these marks are showing. What is this??? I don’t feel this is the natural stone looks like clearly defined marks left by something.