"Rob Houston" wrote in message
...
I need to re-grout a bathroom ceramic tile floor with badly discolored
grout. The grout line width is 1/4 inch. What is the easiest (and best)
way to remove at least 1/16 - 1/8 depth of the old grout? Is there a
power
tool that won't damage the tile?

Never tried it, but Dremel makes a bit just for that.
Ed