The article was written and the photos taken 8 years after her disappearance. Based on this, my comments as follws:
Ultra violet light and alley man - I seem to recall that the first sighting of alley man was early evening before Claudia spoke to her mother and the next sighting was early next morning . I doubt that CL would have been using the sunbed in the morning, but early evening before settling down to watch TV is a possibility.
Mop and Bucket - I dare say that someone has cleaned the house during those 8 years;
The Fireplace - I am presuming this is an open fire and the 'ash' is from the chimney - we get the same usually after a peiod of heavy rain. And again pic taken 8 years after her disappearance.
Clothes rummaged - this looks like a normal girls wardrobe space to be honest.
Cardboard boxes - again pic taken 8 years after disappearance, perhaps her father had a sort out of belongings?
Weighing scales - I think this is fingerprint dust and not household dust. Any women worth their salt would not let the weighing scales get dusty.
which item do you think is a sanitary item? I thought it was the packet for the plastic gloves that come with the hair dye?
Hair dye and bleach - No ideas for an alternative use, but bleach on its own would be good to remove any stain. IMO the hair dye is a red herring - if hair was coloured it would have been at the weekend not during the week.
and lastly, the door - I cannot locate the pic you are referring to, are you able to post please?
This article explains the boxes
Eight years after the disappearance of Claudia Lawrence her mum reveals her agony upon return to missing chef's broken home