Stainless Steel track probably rerquires less cleaning, however it does not carry current as good as brass.
As I live in a semi tropical part of the world, in Queensland Australia, I am using a mix of Aristocraft, LGB and local Aussie Brass Flex Track, I have about 200 feet of track laid for over three years now, minimal maintainence required, if running weekly, just run my Aristocraft Track Cleaning Car around on the first train, but if not used for a while, I need to walk around with my home made track Cleaner a Broom Stick with a Dry Wall Sander attached, no bending.