Brick cleaner, black spots

[bm_999]

Hi all, just wondering what is the best brick cleaner to use
Have jet washed the drive and some spots on the actual sand brick right on the bottom is not coming off

Thanks

 

[bm_999]

Are the spots organic? If so then try a limited application of bleach.

No idea, just daw them after jet washing the drive

Brick acid. Apply by brush. Leave for 10 min, rinse and repeat if necessary.

Any from.amazon or similar?