You didn't mention if the grout was colored. Be very careful to NOT use any bleach based products on any colored grouts. Something that works good on all types of grout is bon-ami mixed with vinegar. ... read more
Big +1 to Abe's feedback.
He is 100% right on the differences.
Inserts can be done very effectively with no weak links in the system in a vast majority of the cases. Where it really pays dividends to ... read more