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 This is after scrubbing and the grout used to be white. I think it just has to be redone. https://image.nostr.build/b2d484454b79af1d8b15571fbe66da668b2633b6774c71fa124bf8a87212301c.jpg  
 Try bleach yet? Just spray it and come back in an hour. I also like 3M heavy duty brushes you can put some elbow grease behind. 

Where the tub meets the tile use a bathroom caulk. Run a piece of painters tape, run a bead, dip finger in windex or use a silicone glove to run your finger across the joint. Pull the tape. 
 believe it or not, toilet bowl cleaner. clears out serious stains.