For my project i made a model of a room inside of Google Sketchup (2014), which was then imported as a .dae file, i added a plane to use as the mirror (because sketchup cannot raytrace (make mirror surfaces)).
I used www.chocofur.com/6-shadersamptextures.html for the nodes (specifically the 100% reflectivity one found there)
yet when it renders there are white particles left-over (which are not there without the "mirror")
EDIT: So i found a way to greatly reduce the fireflies, i did this by mixing two scenes, the end result now looks like this