Clean the Grout in a Shower or on a tile Floor - PEP BB nest.straw.cleangrouttile

I made a citric acid spray cleaner using 60ml of powder and 500ml of hot water.
I scrubbed the floor with organic Castile soap to remove any oil residues.
After rinsing, I sprayed with citric acid spray and left for 20 minutes.
Then I scrubbed and rinsed. There was quite a big build up of iron in the grout and on some of the wall tiles and floor tiles.

I also cleaned the walls, but this is a tile floor submission.

The tile shower needed cleaning so perfect timing to clean it and get a badge bit.

I poured some castile soap in a bucket of warm water and scrubbed with a brush and a washcloth.

Thanks to the thrill of earning a PEP badge I used a natural cleaner instead of a typical cleaner someone told me to use!
This floor hadn't been cleaned by the previous tenant for years. Vinegar & water wasn't doing it, so I wet the surface liberally with the vinegar & water solution, then sprinkled baking soda on it. As per my elementary school science class, a fun fizzy action occurred and left a paste, after which my elbow grease worked much better.
Altogether I used: water, vinegar, baking soda, a bucket, a sponge, and a stiff brush.

The floor has barely been cleaned since 1980, so perfection will not be achieved. We will do some minor grouting &/or caulking along some edges, but I would now walk barefoot on that floor!

Bonus for me: When the other person used Mr.Clean in another part of the house I needed a respirator because it was so strong, and I am prone to migraines and have had lung issues in the past. I was VERY happy to see that baking soda and vinegar did an equal job, and the other person was very surprised. You have changed the world in yet another small way.