hi there deerefan,
those cleaning logs don't do much... not much more than like burning $money$ /forums/images/graemlins/blush.gif The logs don't treat the conditions which cause the creosote in the first place... and I doubt they get hot enough to burn off the gunk either...
i burn pine, fir, and other softwoods. Almost every day in fact ( burn anything which will catch fire and provide heat /forums/images/graemlins/laugh.gif ). Any wood can cause creosote, since it is caused by cool temperatures in the chimney and moisture in the wood. Sap is, more or less, more moisture in the wood. A good way to prevent creosote is to burn hot and try to stay away from low temperature smoldering fires.
I'm happy that you are keeping your heating bills down by heating with wood. Me too. I"ve only used about 400.00 of heating oil this winter and I think that is a very good thing... Next year, maybe even less!
Can you point me in the direction of more information on heatilators?