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Dear Heloise;

I ran an air-powered RUGF for a while in a thirty gallon tank.  What I didn't 
notice behind the tank was the two brown spots growing on the wall from 
incidental foam fractionation which was going on in the lift tubes, and 
atomizing as the bubbles broke at the top.  I removed the filter a while ago, 
and ignored the wall, because I couldn't find anything to clean the DOCs off 
the wall.  This week I had to move the tank over about a foot-and-a-half, and 
now the spot on the right is showing.  Any suggestions on how to get this 
wall clean without painting it?

Bob Dixon