Hi All, We've been fulltiming in our motorhome for 3 years now...I am wondering...does anyone know how to change the filters (are there any filters?) in the furnaces?? We used to do it monthly in the house...but I can't find how to do it in the coach! Also, what about the plumbing...after so long...don't we need to run some kind of cleaner through the pipes from the sinks and shower? I can't seem to find any substances that would be good and SAFE to use in the pipes. Any suggestions?? Thanks!!