Happy Holidays everyone

So, I finally got my 100 GPU mini farm up and running.. trying to control the dust has been a challenge, so I wanted to ask you folks..how do you go about cleaning/maintaining your GPUs? Do you shut a rig off and individually clean each GPU? or do you just blast them with an air gun without taking them offline? The more dust being collected under each fan means more wear and tear for sure.. so I'm not sure how to approach this lol