Since this is a, er, family MB I will leave Members to imagine my darkest thoughts when, after completing his inspection he said "I am not displeased with the changes you have made", but then pointed out "That window is completely mucked up and must be cleaned".
What a, shall we say, prat! Is there anything in your agreement that says you have to live up to his levels of fastidiousness? I'd tell him if he wants everything kept exactly as he likes it he should live there himself rather than letting. As Fallen Star hints, though, not all landlords are that bad. I had a landlady once whose standards were extremely high but she was nothing like this guy. She gave me the keys to an absolutely pristine flat, then never bothered me for the 12 months of my tenancy apart from asking me if everything was OK when I paid the rent (she never even knocked on my door but waited for me to call on her with the cash). When I left she deducted £50 from my deposit as she had to spend half a day getting the place as immaculate for the next tenant as it had been when I moved in. Exactly how it should be. I'm sure I could have spent a lot of my own time scrubbing the nooks and crannies of the place and she'd have given me the full deposit back; but I didn't - and, frankly, thought I got off lightly with £50 for work that would have taken me much longer than it took her. What a contrast with my last landlord. Despite the fact I paid his own recommended cleaners to do the flat after I left he tried to withhold money for damage that was already done when I moved in. I took him to court and he ended up paying over £500 instead the £150 he tried to withhold. I also popped a copy of the court judgement into the letterboxes of all his other tenants in case he tried the same trick on them. The best thing about getting a mortgage is that I'm free of people like that. As long as you're not doing any damage or creating a health risk a landlord should let you live in a way that suits you. That, after all, is what deposits are for.