My renovator put together my beautiful new shower, and now that he's
gone, and I've had an opportunity to use the shower for a couple weeks,
it seems that the grout was not fully washed off my porcelain tiles.

I have a couple questions.

1) What is the best way to remove the film of grout from the surface of
tiles? It seems to have hardened and the true colour of the tiles are
not coming out as they look dull due to the grout on the surface of the
tiles? If I need to scrub it? what should I use?

2) I do have a large shower, (4x8), and I would like to seal it once
I've cleaned it up a little. What would be best for a shower? Does it
make a difference if I seal it now or say a month of shower use later?
Does it make a difference if the surface grout is not cleaned up before
I seal it?

Thanks for your help
Bill