A little care can make big difference.
1) Please don’t save Naked Damascus Steel Blade in leather sheath for longer time unless its been oiled/coved and then kept in sheath. Leather sheath can absorb moisture and rust your knife (It is also recommended for other kind of Steel too)
2) If in any unfortunate circumstance, your item gets rust, use any anti rust liquid like WD-40 and wipe it off with sponge or thick piece of cloth.
3) Damascus Steel Knives are not Dishwasher Safe. After Washing/Cleaning knife, please wipe it off and lubricate the blade with any Oil or Wax until next use. You might not have to do that after every use, but it depends on Country/State you live and also type of Damascus Steel Blade.