Use a stiff nylon bristle brush and scrub the crud out of the grout, let it set until the bleach and oxyclean lighten it up enough for you, and then rinse it really well.Good luck!

Also, it appears a lot of people are fleeing the cities so I would expect things to get more normal once covid is in the rear view mirror. ie, the supply will increase and the demand may lighten as well.

Lighten up, Francis.

Lighten up Melvin 

Being that you have about 4 to 5 properties I would hate for you to lose them but sounds like you may need to lighten your load a bit ( sell a unit or 2) and prepare to start over but the right way.

This would be less likely than getting struck by lightening and it has apparently happened two times already.

@Jay Hinrichs  You would think after the fires in Napa if they would be lightening up on builders and streamlining the process. 

Lighten up @Robert Leonard  - Get creative like @Jason Eyerly suggests.  

I never knew in my personal home that there was water leaking in from the outside into my panel until I did a bathroom and kitchen renovation; the wires were frayed, rust in the panel (just a hot mess); the electrician said I was ONE lightening spark away from a hazard (including death or injury of myself or my family). 

It looks like a smaller house, so you want to lighten it up as much as possible.