I think the material of the tub is the problem. Some cheap plastic most likely. You can scrub as much as you want it is not dirt.
A cream-colored bathtub… 
Could also be urine stone… 
Adelina or Mary cleaned it once and it came up fairly white then, it looks very badly stained with grime that would come off ok with a paste cleaner ok.
Taken earlier smoking in the kitchen while dirty pans and pots in the sink. the container with cigarettes in left by the hob
Another ceiling cam…
Cam 7 in the bedroom also needs to be adjusted as the room appears to be located in a certain tower in the Italian city of Pisa 
VH wanna ban all these fucking stupid lights, ruins any views and makes most unwatchable 
Makes a lot of sense cleaning dirty floors in bare feet duhhhh
The same principal as using the kitchen as a smoking room with the discarded cigarette ash placed in a bottle next to the cooker as well. 