Moving from CSGO you may have got used to using shift, r (reload), movement (w,a,s,d) to bind "r_cleardecals" and similar commands via the console to have a smooth game play with no unwanted decals obstructing your aim and game.
You may have wanted the same experience for CS2 alas the scripts do not seem to work. most binds will not work even for no usable keys. There is no option to remove decals (bullet holes, blood splatter etc) from the walls, backgrounds of maps.
Although there are videos online and guides do not follow them until steam/ valve confirm that there is a script that can be used without braking any rules.
If one is to go and bind r_cleardecals for cs2 he could get banned as its not part of the game in a legitimate light.