Light Mildew: spray Hydrogen P or Milk?

So my plant has started showing what im pretty sure is a little mildew on leaves here and there, not much but its increasing. i am pretty darn sure it isnt spider mites, the bottom of the leaves look fine everywhere, no mites or specks or spots of any kind. Another reason i think it is mildew is i close my closet for the dark period of flowering, and there is no fan or anything running. although it is far from airtight, i figure the lack of circulation and mostly closed environment during dark time has made a little mildew develop.

so anyways, i searched for solutions and i find two easy ones people have used: hydrogen peroxide diluted and sprayed on, and non fat milk being diluted and sprayed on.
which would be better, if any, for my problem? any experiences or thoughts appreciated!

I think I got the same problem... I think i dont have enough circualtion because when I water my plants, the soil stays plenty damp for days.