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merdub t1_j9thp1c wrote

Reply to comment by Jisp_36 in Tile installed on concrete by foxrue

I might be wrong so someone is welcome to correct me but I read that using bleach like this can break down any sealant and actually cause the grout to become more porous and stain even more.

I still do it because like you said, it works, and I live in an very old apartment rental and if those floors were ever sealed it was probably 30 tenants and 60+ years ago, but I don’t think I’d try it anywhere else without looking further into it.

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Jisp_36 t1_j9tjfl3 wrote

I based my comment purely on the photo that the OP provided which looked to me like the grout was way past the point of any concern for sealants that may or may not have been applied previously. With no disrespect intended to the OP, is is clearly a well aged bathroom. Ask me how I know, lol. 😁

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foxrue OP t1_j9vnone wrote

None taken! Actually, this bathroom is ten years old. The building was completed in 2009 and every corner was cut in the finishing.

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