Your opinion on using used items/supplies for your dog?

I work at a thrift store(Unique thrift store) and we have TONS of used dog/cat stuff. I honestly think its just a bit gross to use some used pet items, but that's just me and my mom is a germ freak and she says its unsafe so we never do(though I have nothing against it, its just weird to me). Most of the stuff is usually bowls, crates/carriers and sometimes shampoo and clothes. What is your opinion on buying used stuff for your dogs? What is ok and not ok to buy that is used? Is it unsafe?