Caulk should be used between the tile planes where there is flex and movement between the tile planes.
Grout or caulk between tile and tub.
Or where the edge of a tile meets the wall.
Let the area dry the area for the minimum of what the moldicide recommends which is usually at least 24 hours before applying new caulk.
That moisture is coming from behind the tiled wall.
Then once it gets wet for a while the caulk basically turns to gooo and can be wiped away.
I am sure you have all seen that grey discolored staining of the caulk that you would swear is behind the caulk where it cannot be cleaned off.
Grout not caulk where tile meets tub.
Caulking tubes are designed to apply pressure to the caulking within them so that you can squeeze out a bead of caulk with ease and precision.
Learn the difference between grout and caulk and see why tile doctor s epoxy grout is the best option for grouting projects.
Grout keeps the tiles from.
Hence the puzzlement of why one can t clean caulk that appears to be sound.
His explanation makes sense.
If this happens in your home remove the grout and replace it with caulk.
Caulk traps moisture that s behind it by not allowing it to evaporate.
Caulking is much more water tight and will not allow water to get between the tile planes and leak behind the shower.
Do cut the tube of caulk the right length.
The sole purpose of grout is to fill the spaces between tiles after the tiles have been glued in place on a floor or on a wall.
Where grout is just good for bonding together tile caulk is good for creating a seal between multiple materials say between glass tiles and a porcelain tub.
And then there s this from a home inspector.
Caulk is a sealant typically made of silicone or acrylic material.
Grout fills the joints between tiles.
Some contractors grout the space between the tile and tub.
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As a home settles however grout can crack.
Caulk will also flex much more than grout and will not crack and break when there is movement in the caulked areas.