I want to make a map with a different effect than the normal cleanser effect, what other ones can I use?

make your own. read up on the particle editor.

p0rtalplayer wrote:
make your own. read up on the particle editor.

U IS SO HELPFUL! I CANNOT BEILIEVE IT!

Anyways, to better explain. You'll want to try out using the particle Editor which you can access via setting a launch option on portal called "-tools". This also works on any other Orange box games. Tools mode allows you to do quite a few things, but specifically on the particle editor you'll want to check out: http://developer.valvesoftware.com/wiki/Category:Particle_System

There are a few tuts there on starting off with particles. I know as well that a few tuts on Interlopers exists that run you step by step. Though I can't seem to find the exact one right now, but it was written by N00bDylan.

Also open up VALVe's stock particles and examine them. I've made a few custom particles, and while they're nothing too fancy, they're still fairly good looking; a lot of help came from looking at the things VALVe has made. Mess around with them, change values, see what happens.