Disabling Sprays for Online Games

http://support.steampowered.com/cgi-bin/steampowered.cfg/php/enduser/std_adp.php?p_faqid=382

To disable sprays, enter the following into the console: cl_allowdownload 0

This will disable your computer from downloading any sprays being used by other players.

To enable them at a later time use:

 cl_allowdownload 1

If you want to leave downloads enabled, you can remove any offensive sprays manually.

To do this, you would place the crosshairs over the spray and then enter the following into the console:

 cl_removedecals