Also, if she has issue with contamination then you not having proper cloths for things would also drive her anxiety sky high, which could be why she's provided you with cloths in the past
Perhaps, but she actually had no need to go to our sink anyway. And surely using kitchen towel, or disposable wipes are far more clean than re using old cloths? I mean its not like I handed her an old scrubber thats been in use for years 
RE contamination, I find it odd that she and fil happily feed the DC off their own forks, once after FIL had nasty illness
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Am reading through other responses.
Dare I say it - but Mils culture/ country of birth is famous for its clean obsession and her family are more relaxed than her but without a doubt on the same page. Fil also is a bit of a neat freak! He was in army and has to have things orderly for instance, a hand bag not left in the utility room will send him in a spin 
I guess this is why she has to have the DC there so she can wash them, wash their clothes, get them nice and clean to be in the house.
It would be easier to bear if she was a nice person, she has done some OK things over the years but I dont think she has ever said a single nice to thing to me and it seems she doesnt like other people to either eg her mother - DH grandma said once " Gobbolino the children are so nicely dressed, I really like the way you dress them" MIL shot me the most filthy, dirty look and then looked at her Dm like a traitor. She still tries to dress DH and has made a huge fuss in the past about dressing him for events. I will send my DC there if overnight with clothes but she will usually re dress them! And they come back in new outfits. I try and be grateful and I am but I cant help feeling she is also doing it because she thinks the way she wants them dressed is better. She also dresses SIl who is 35 
She could have walked in the room and said " oh how lovely, you have both done a great job, by the way I have some throws here do you think it would be a good idea for me to put some down?" But its the way she came in - with purpose all thought out. She has sat on our sofas in the past and how does she know the throw she used from us is washed? ( it was it all was!) DH interacts with her but only on a very superficial level you cant get close really its so odd. Even though we have spent many times together and events I dont feel we could say " oh remember that year bla bla" because nothing happens there...convo is always light and DH has massive issues with her too. She has zero emotional connection to him.
It would be so much easier to take if it was contained eg my DF is obsessed with sinks too! He bleaches his all the time and if he stays with me, he will bleach it every morning, and then has a strange tea ritual where he boils kettle loads of times to warm his cup
, then tips it out then more boiling water until its the right temp. DF is obsessed with that and washes under running water, washes his hands more than most but he just gets on with it, then can turn his attention to other things during the day and he would never imply he has to bleach our sink because its dirty, or that we are dirty. He just does it if you see what I mean?
At xmas in their house we are not allowed to drink red wine anywhere but sat at the table you couldn't pick it up and walk to living room with it. I feel anxious in her house and uncomfortable, you un wrap a gift and there is tension until the paper is put away, I mean why bother wrapping?????? Its so awkward and annoying. Its like a church in there, mils hallowed ground.
I just find her so miserable to be around, wanting the music low - constantly turning it down yesterday! The comment about my DM picture..."oh".