Best Silicone Grout Sealer What's The Best Way To Get My Tile Grout Super WHITE?

What's the best way to get my tile grout super WHITE? - best silicone grout sealer

I would try Oxyclean ... but I wonder whether their country was a sort of acid or something explodes. The mortar dog makes me crazy.

Moreover, it is a kind of silicone sealant in the grout can be after what I paint is to be nice and white? To prevent something that collect dust back into the mortar?