Here is a close up

Here is a close up

{{!gwi}}

I think silicone caulk is your best option.

Remove the grout completely and then caulk with a sanded caulk matching your grout. That should be done at every change of plane like the shower corners and where the walls meet the floor.

Hollysprings - what do you mean by change of plane? So, I need to put caulk where two tiled walls meet in corners of the shower? Also, where the tub meets the tiles? Also, where the tub meets the floor?

All of that was grouted by the previous owner. I thought I read somewhere that you don't need to caulk where the tiles meet the tub...