Can CLR be used on rocks that contain a heavy amount of rust and limestone?
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I have used CLR and like to see it foam when it is working. However, it is a bit expensive for cleaning rocks. I have had similar results with vinegar and time (what CLR will do in 20 min will take overnight with vinegar). Iron Out is a pretty good alternative too. Some people swear by coke cola, but I have not had much success with it. I also use some of the stronger acids (outside and with care).
One thing about CLR, that I learned the hard way, is keep the drips away from your countertop. It can pull the color right out, if it is not wiped up fairly quickly. I left some drops overnight which resulted in dime sized round white marks. The kitchen counters have since been replaced, so I am no longer in the doghouse. ;-)
MAybe one day they will make a carafe / pot that actually has a functional "lip" that pours that first full pot without that spillage.
You would think that in the 1000 years of coffee making they would have ironed that one out.
The CLR worked well on the rocks with a lot of limestone and uncovered plenty of fossil impressions. Not too bad .
Ok, Penny, I have a favorite!! In Pic #1, it's the rock in the extreme lower right. The rock is 1/2 cut off in the lower left of Pic #4. Then is shown fully in upper left of Pic #5. How big is that? It's awesome!! ...Yep, I just used up enough data time to view them larger. That one is definitely my favorite!
Hmm..it looked bigger in the picture. View attachment 1311505