Remove all old grout before regrout?
I recently bought a house and the main shower had some grout that was chipping away and maybe even allowing water under the tiles. I figured the best way to proceed was to regrout the whole shower.
Reading some tutorials online, every one suggests removing the old grout using a grout saw and/or a utility knife. I did this (what a pain!) but there is still grout that is securely between the tiles and would take a lot more work to chip that away.
My question is, do I need to remove _all_ the old grout before applying the new grout or is removing the loose stuff and the top layer of the old stuff good enough?
Here is a picture of how it currently is. Note that that at places all of the grout is removed and at other places it is only scraped at but not fully removed:
Also, does anyone have a good tutorial on how to apply the grout on corners and on edges?
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