Trying to undo the DIY fail
I decided the best thing to do was to try and remove the new mortar. Thankfully I only did the bottom step. I tried all kinds of solvents to dissolve the mortar and nothing was really working. I spent some time researching masonry and learned some things. It seems like muriatic acid is the go to solvent, although a lot people prefer newer less dangerous solvents.
Having never worked with muriatic acid, and not being the most careful person, I was reluctant. Then I learned that muriatic acid and hydrochloric acid are similar and that Lysol toilet cleaner contains some hydrochloric acid.
We had some Lysol toilet cleaner so I gave it a try. It worked pretty well! It wasn't like the mortar melted away, but it loosened up enough for me to get it off using some elbow grease. I also learned the trick of using stone to clean stone. I used an old paver to sand the mortar away. It took a few rounds of Lysol and scrubbing, but I finally got the mortar off.
The neighbors were a little curious to see me out every morning for a week at the crack of dawn scrubbing away at the steps. One lady was walking by and called out "they're clean - you can stop". I laughed and told her how I was having to undo a DIY fail.
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