Poland has still no access to the airplane remains: http://www.wbj.pl/article-59216-russia-to-return-smolensk-cr...
The wreck was left on open air for several months: http://en.rian.ru/world/20110112/162110789.html
..than washed by Russians: http://freepl.info/2380-tu-154-wreckage-washed-itself