How Do I clean this?

[Jared]

This wall is a stone of somesort. Unfortunately I am not sure what it is but it seems to be porous? Looks like rough finished concrete. There is unpolished marble a foot away from the wall. The wall was hit with marker and then the manager had someone try to clean it with some chemical, which he wasn't sure what it was. He would like me to clean it but I am not sure how to procede. A friend recommended one restore, which I have. I wasn't sure if taginator would be a good choice. Can you give me a recommendation and process? I need to be careful of the marble as well as the glass that is about 4' away.

 

[ACE PAINTING]

I've used taginator on glazed brick before. Worked great.

 

[steve rose]

if that dont work try fadeout.looks like they just used a rag with out rinsing.you should be able to re-agitatewith tag or like product and wash off.

 

[innovativewash]

My first choice would be One restore.

 

[The Cleaner]

Whatever you use you better be right or up your insurance before you take on something you know nothing about?

 

[Guy Blackmon]

Whatever you use don't promise anything, get him to sign off on a disclaimer. You have no idea what was used before, chem reaction? Possible Damage? Stain set in? Who knows?

Price accordingly with no promises.

 

[Jared]

We do a lot of cleaning for this customer both on windows and flat work. My knowledge of stone is limited so all the help is appreciated.

 

[Tally Roof Cleaning]

It would be nice to know what chemical was used to try and remove it the first time. As Guy said, have him sign a disclaimer and do small test areas with Taginator or One Restore.

 

[Jared]

Thanks Jim. I used the One Restore and it turned out great. This shot is at night as I finished so it isn't the greatest for seeing how bright and clean it came out. The manager just added $4,000 worth of work. Thanks for the help.

 

[Diamond Jim]

In the future work up to the one restore. Have a bag of tricks in the truck, make sure you know what type of stone it is before you start.

 

[Jared]

What would be a good less aggressive starting Chem to try?