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Brian, Architect
Category: Home Improvement
Satisfied Customers: 2153
Experience:  Licensed Architect- 17 years, L.E.E.D. AP
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I used CLR to get some rust stains off my cement garage

Customer Question

I used CLR to get some rust stains off my cement garage floor in preparation to etch/stain it. It left a white residue that won't clean up. When i put the etch/stain down, will that show through, or will it clean it up?
JA: Have you talked to a construction professional about the floor?
Customer: no
JA: Do you plan on doing the work yourself?
Customer: yes
JA: Anything else we should know to help you best?
Customer: i was just prepping the floor nope..
Submitted: 1 year ago.
Category: Home Improvement
Expert:  Rick replied 1 year ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.

Keep flushing it with clean water. The C in CLR is for calcium. Concrete is partly limestone which is calcium so the CLR is attacking the concrete. There's no way to know how this might affect your stain appearance. Only a spot test will tell but first you have to get rid of every trace of the CLR.