Grout in 20 year old business tower


Hello all.
    I am currently working a second job as a floor man in a business building. I have 48 floors to cover. Since I only do the bathrooms it's not to bad.          But I am having a problem with the grout. You can see in some of the sections that the grout is supposed to be pink instead of black. We have purchased an acid based soap that works somewhat but is rather expensive and rather toxic to breath.          So looking for a cheap and healthier way to do this. Any ideas?
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NICKODEMOS
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wrote:

Buy the strongest vinegar you can find. Or, a 15% acetic acid solution may work. You can buy acetic acid from a chemical supply house. A product containing oxalic acid (CLR or Bar Keeper's Friend) might work too. Applying with a brush, rather than a spray, is better for your lungs. Use rubber gloves.
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I am in agrreement with Phisherman. I could add this and that to improve the general sparkle which you seem to desire, but have no reason to object to advisements given. I am, however, puzzled as to why anyone, in this day and age, would wish to clean 48 floors all in the one push, I can only assume this is in a paid capacity, and you require such funding. It would seem to me, a man who has never actually worked in the 'traditional' sense. that there are many young and possibly less established older people out there cleaning away, professionally, and probably performing other menial duties I'd rather not even think about, let alone considering for an option as a 2nd job. I'd not do the first, but then I don't need to, which doesn't take away the fact that Phisherman does, on the occasion, serve his purpose here. But, re,emeber folks, this is a HOME cleaning newsgroup, and industrial queries should be forwarded to a business group elsewhere. I have no link to provide.
Good day.
Mr F. Bentos
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wrote:
Hello again.
    Sorry it has taken me so long in replying to your answers. I just wanted to thank you for the help you have given me. And yes I knew this wasn't the alt.business.cleaning group so I beg your forgiveness on that.     The information that you gave me did lead to some answers but it seems that the best thing to do was use a high power sprayer with hot water. It cleaned out the years of dirt buildup but not the grout itself. That was where the cleaner came back into play.
    Once again thanks to you two for your responses.
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NICKODEMOS
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