Carbon steel is very, very easy to care for. Just wipe it off when you're done cutting something. Even if you don't wipe it off, it's not going to rust away on you before you get home that night. At the most, it will stain a bit, but thats a good thing. A patina will help keep theblade from rusting a bit like gun blue on a firearm.
Too many people brought up in a shiney stainless world think a carbon blade is going to rust away on them almost overnight. Actualy you have to really neglect a carbon blade to get rust. It will want to stain first. Stainless steel is a pretty new development in steel. When the Roman leagons marched they all had carbon steel gladiuses, as well as the Vikings and conquistidors with thier carbon steel swords. They just took care of them.
When you first buy your carbon steel knife, clean the blade off really good, make sure there is no greese or oil on it. Then just use the heck out of it. Let the blade stain to a good grey patinia and enjoy it. It's supposed to look like that. To try to keep it looking like a new stainless blade is an exersise in futility. Some folks say to stick in a potato over night, and that works pretty good. Others have had good luck with a vinigar induced patina. Thats okay too. Or the best way is to just slice up an apple twice a day and let it stain that way. Onions are good too.
Go get a carbon steel Boker and enter a new reality. Grey blades are good.