The way to care for the vintage clothes is closely dependent on the kind of clothes you buy. For instance, if you buy vintage jeans perhaps from the 70s, you can simply wash them together with any other jeans, though you would probably need to keep it away from fabric softener as it tends to break down all material over a long period of time.
Assuming you are buying the designer dresses or any kind of delicate items, you would probably avoid washing it if possible. You could consider dry cleaning so long as you trust them well. Do not bring the clothes to some dry cleaners whom you have never engaged before as they might just ruin it. If you intend to hand wash it, do use detergent such as Woolite for the job. Do ensure hand dry them. Do note any cleaning directions that are already provided by the store and stated in the clothes.
Do check out Vintage clothes Online for more related information.