Hmm, I think some Mr. Clean and a mop and a rag could take care of those marks.

In 8.0, whichway and others were taking Irradiance Cache in the 99's. There was even talk about if it dropped below 99 and what the effects were.

However IDL was changed a bunch on 8.1, so I don't know if what they were saying is true any more and I have not tested enough yet. 

Gary

"Those who lose themselves in a passion lose less than those who lose their passion"