Did my first Tile & Grout demo and got the job!!! I have questions though.

I did my first T&G demo and got the job, used Tile Master and spinner. View attachment 28697

I am going to do it this Friday. There are some water stains near a small fountain, do I need to do anything special to clean that area??
View attachment 28698 View attachment 28699

Also, I want to seal the grout, what sealer do you guys prefer and what's the easiest way to apply it?
And lastly, what should I charge per square foot?
It's two entrance areas of an apartment complex, the...

Did my first Tile & Grout demo and got the job!!! I have questions though.