Clean it with hydrogen peroxide and paint over it with an oil based primer paint.

2024-01-03: Major Detroit Developments for 2024https://michiganchronicle.com/2024/01/03/major-developments-that-will-define-detroit-in-2024/2023-12-13: Volkswagen Scout Brand investing $11M in Detroit, 200 new jobshttps://www.teslarati.com/volkswagen-scout-11-million-detroit-investment/2023-11-02: Hotel Added to Hudson Site, total over $1.4Bhttps://www.detroitnews.com/story/business/2023/11/02/hudsons-site-hotel-plans-move-ahead-as-city-issues-permit/71426631007/2023-11-01: Detroit west side Dexter Neighborhood Receives $21.5Mhttps://www.clickondetroit.com/news/local/2023/11/01/neighborhood-on-detroits-west-side-receives-more-than-215m-in-investments/2023-09-27: Norway’s Nel Hydron investing $400M, 517 new jobshttps://businessfacilities.com/nel-hydrogen-will-build-400m-gigafactory-in-southeast-michigan#:~:text=In%20Southeast%20Michigan-,Nel%20Hydrogen%20Will%20Build%20%24400M%20Gigafactory%20In%20Southeast%20Michigan,green%20hydrogen%20using%20electrolyzer%20technology.2023-09-08: Chase invests $200M in Detroithttps://www.axios.com/2023/09/28/detroit-rebound-jp-morgan-investment2023-09-06: Gilbert Foundation invests $439M in Detroithttps://www.henryfordmsu.org/news/september-2023/gilbert-family-foundation-announces-nick-gilbert-neurofibromatosis-research-institute2023-07-26: Bollinger Motors investing $44M, 237 new jobshttps://michauto.org/bollinger-motors-plans-44m-metro-detroit-investment/2023-03-30: 15 New Detroit Developments to Be Excited Abouthttps://www.metrotimes.com/detroit/15-new-detroit-developments-to-be-excited-about-photos/Slideshow/32734721/327353922023-03-28: BorgWarner Investing $20.6M, 186 new jobshttps://www.crainsdetroit.com/auto-suppliers/borgwarner-invest-206-million-create-186-jobs2023-03-28: 3 International Companies Choose Detroithttps://www.detroitregionalpartnership.com/international-investment-comes-to-detroit-region/2023-03-06: District Detroit $1.5B Development, 12,000 temp jobs, 6,000 new jobs2023-02-09: 6 New Residential Developments in Detroithttps://detroitisit.com/6-new-residential-developments-in-detroit-to-know-about/2023-02-08: $2.5B New Center by Henry Ford Health, Pistons owner and Michigan State Universityhttps://www.clickondetroit.com/news/local/2023/02/08/incredible-investment-in-our-city-25b-detroit-neighborhood-redevelopment-to-begin-in-2024/2023-01-31: $300M Huntington Place Renovations & New Detroit Hotel https://www.crainsdetroit.com/real-estate/huntington-place-renovations-new-hotel-deal-reachedContact us with any questions you have.

@Mindy Jensen,I would got to a big lots/dollar store and buy a couple of power toothbrushes. or get a good round brush into a longer bolt into your drill and have a go. or attach a stiff brush to a multitool/vibrating sander (i know you have at least one of those in your collection :-P )before bleach, first try peroxide + baking soda (or any oxy type of booster) + hot wateryou could try steam cleaning (not sure of effects of steam on porous travertine)source: whole tiled basement with former dirty owners and dogs. i didn't have travertine so i used some vinegar for boost. pretty clean after 3 moping-sessions.

One can also argue that our actual existence is also limited to the Table of Elements and we are mostly water, Hydrogen and Oxygen.

Intel is a great example, who is building the largest chip manufacturing plant in the US right here, and it will be a $20 billion dollar investment that brings a few new thousand jobs.https://www.dispatch.com/story/business/2022/01/21/intel-ohio-building-computer-chip-factories-licking-county-jersey-township/9173472002/ Another example of economic growth is the upcoming Ohio State University Wexner Medical Center Inpatient Hospital which is a 1.9million square foot hospital that will bring over 800 new beds and a thousand new jobs. https://abc6onyourside.com/news/local/new-osu-hospital-expected-to-transform-health-careHere are a few more recent investments https://www.10tv.com/article/money/business/hydrogen-power-company-hyperion-bringing-700-jobs-to-columbus/530-25907aab-5517-4661-a9f3-d2ed2d5be6b0 https://news.wosu.org/news/2022-02-08/rumpke-to-build-50-million-recycling-facility-in-columbus Check out The Complete Guide to the Columbus, Ohio Real Estate Market which goes through the Columbus, Ohio market in depth and will give you a better scope of where the highest levels of growth are taking place and where to look to invest.  

I read online this recipe hahamix one teaspoon baking soda, one teaspoon vinegar, ½ teaspoon orange essential oil, and about 5 ounces of hydrogen peroxideGood luck with it!

Intel is a great example, who is building the largest chip manufacturing plant in the US right here, and it will be a $20 billion dollar investment that brings a few new thousand jobs.https://www.dispatch.com/story/business/2022/01/21/intel-ohio-building-computer-chip-factories-licking-county-jersey-township/9173472002/ Another example of economic growth is the upcoming Ohio State University Wexner Medical Center Inpatient Hospital which is a 1.9million square foot hospital that will bring over 800 new beds and a thousand new jobs. https://abc6onyourside.com/news/local/new-osu-hospital-expected-to-transform-health-careHere are a few more recent investments https://www.10tv.com/article/money/business/hydrogen-power-company-hyperion-bringing-700-jobs-to-columbus/530-25907aab-5517-4661-a9f3-d2ed2d5be6b0 https://news.wosu.org/news/2022-02-08/rumpke-to-build-50-million-recycling-facility-in-columbus Check out The Complete Guide to the Columbus, Ohio Real Estate Market which goes through the Columbus, Ohio market in depth and will give you a better scope of where the highest levels of growth are taking place and where to look to invest. 

Intel is a great example, who is building the largest chip manufacturing plant in the US right here, and it will be a $20 billion dollar investment that brings a few new thousand jobs.https://www.dispatch.com/story/business/2022/01/21/intel-ohio-building-computer-chip-factories-licking-county-jersey-township/9173472002/ Another example of economic growth is the upcoming Ohio State University Wexner Medical Center Inpatient Hospital which is a 1.9million square foot hospital that will bring over 800 new beds and a thousand new jobs. https://abc6onyourside.com/news/local/new-osu-hospital-expected-to-transform-health-careHere are a few more recent investments https://www.10tv.com/article/money/business/hydrogen-power-company-hyperion-bringing-700-jobs-to-columbus/530-25907aab-5517-4661-a9f3-d2ed2d5be6b0 https://news.wosu.org/news/2022-02-08/rumpke-to-build-50-million-recycling-facility-in-columbus Check out The Complete Guide to the Columbus, Ohio Real Estate Market which goes through the Columbus, Ohio market in depth and will give you a better scope of where the highest levels of growth are taking place and where to look to invest.  

I scraped off crystallized dried cat urine from the floor in double garage, using a garden hoe, then we power washed it, used hydrogen peroxide in gallon jugs from beauty supply applied that to help get more of the urine up and off..

https://www.10tv.com/article/money/business/hydrogen-power-company-hyperion-bringing-700-jobs-to-columbus/530-25907aab-5517-4661-a9f3-d2ed2d5be6b0 https://news.wosu.org/news/2022-02-08/rumpke-to-build-50-million-recycling-facility-in-columbushttps://www.restaurantbusiness...