Well, Well, Well.
I finally got to the house to size things up.
I found 8 cracked tiles, grout routed lines in the grout and on the tiles. Dremel tool swirls over a further 7 tiles and the edges of nearly all of the lower tiles wore back and/or chipped which is why the brown areas in the photos looked much much worse.
The tenant did finally admit that he attempted to dremel out the grout to fix the staining which was a hair dye his girlfiend used which had also stained the floor tiles too. But he never replaced the grout he removed, he painted it with grout paint from
Homebase!
The agency workman who went over there to repair the problem also used a dremel and then a groute router in which he broke tiles and compounded the wear to the edge of the tiles.
There were 4 tiles in which something super abrasive had been used which completely took off the top layer if the tile surface.
He then covered up the hash up with new grout non water resistant grout, including a lot of the hairline cracks he created when trying to route out the grout with apparently a hammer and screwdriver, evidence of this could be seen by the end of the small screwdriver tip stuck in the grout as it had broken off and the was grouted over.
I could also see that the dremel router tool got away from him a few times as there were swirly marks and scratched tiles from a routed line in the grout.
WTF this guy was on I have no idea.
So with this in mind I decided to strip the broken tiles off the wall.
All in all 32 tiles were damaged, scratched or broken.
The underlying surface (in lower selected areas) were 20-25% moisture saturated (not surprisingly) the upper areas were 10% which is (I think) correct for wood on this moisture detector I bought. There were areas with over 80% saturation but they were only near the bottom of the shower.
So the area was left to dry for one day with a mold and mildew treatment applied.
I tested the moisture levels again and they were 8-15% even the worst hit areas.
So I've now removed 85% of the tile adhesive and just need to somehow remove a stuck shower knob from the fixing and applied penetrating oil to it in the hope this might work.
I have also bought epoxy grout and bal tanking solution to cover the wood as I am not replacing the whole wall, sorry to those who told me to remove the wall and replace it with Aqua Panel. I also have some fancy german waterproofing solution to put onto the wood to seal it before the tanking solution.
This should seal it until these tenants leave.
In hindsight I could have bought two sheets of tempered glass and glued them to the ply for the shower area as I would have seen see the lovely wood behind and there would not have been any issues with weird staining or tenants with dremel tools or workmen with hammers and screwdrivers.
Ah well.
Hopefully this will be the end of the dramas at this house for a while.
Now just have to finish the job off, before I loose too much weight due to the 32 degree heat.