The book 'it starts with the egg' has a few chapters about it, and some more alternative (woo) therapists will advocate for not using plastics etc. Personally I think using nail varnish or tupperware is going to make absolutely no difference whatsoever to the outcome of my cycle
It's science and luck that will get me and keep me pregnant. Not my choice of beauty products or household cleaners
Obviously a healthy diet is a sensible idea, but eating exactly the right things can become yet another thing to beat yourself up with
FWIW I was really focused on eating high protein, low sugar, green juices, no caffeine etc in the run up to my first and second IVF cycles. My egg quality was rubbish
In the run up to my third cycle, because I wasn't expecting to be able to start stims so soon after miscarrying (and I had rationalised that as long as I was technically still miscarrying, I could eat chocolate biscuits for every meal), my diet was absolutely shit. I'd been eating complete crap, and went out and got absolutely shitfaced one Saturday night, not knowing I was going to be starting stims 5 days later
I asked my Dr if we should delay the cycle as my lifestyle hadn't exactly been optimal. He said it wouldn't make any difference - that egg quality was determined by two things: my age, and the ovarian environment created by the stims.
My third cycle I had spectacular egg and embryo quality - we did genetic testing and we know I got one normal embryo from the first two rounds, but 6 genetically perfect embryos from our third
So do eat healthily and look after yourself. But don't beat yourself up with things you think you 'should' be doing. If it makes you feel better, sure. But don't emotionally blackmail yourself into thinking you've harmed the outcome of your cycle by using your favourite hair makeup or cleaning the loo with bleach
Good luck