First go to program files and then steam folder then to the counter strike source.
And then cstrike folder, rename the materials folder and the models folder to a different name ex: sm_materials or sm_modeles folders. So when your play on a different server like ZM just switch the names of the folders back to normal and their you go you get your custom skins back on....

But if you want to keep using your sprays just open your materials folder, then copy the VGUI folder and paste it on your desktop then reconnect to steam and Counter Strike Source.
After that go back to the cstrike folder and copy & paste the VGUI folder you saved on your desktop into the new materials folder and you have your bad ass sprays again!

Credits;
-Bio {AKA TX_OuTLaW}
-JohnnyBoy (aka Best Admin Ever)