On 7 Jun 2006 05:43:40 -0700, "louise"
wrote:

Thank you Peter but how come other apartments who use the heater more
have no dust or discolouration at all??

All will have some - but it may not become noticeable for some years.
Possibly they have been redecorated in the last year or so, possibly
they are a bit better placed not to pick up so many vehicle fumes.
Candles contribute quite a lot of carbon, particularly if they are
used to mask cigarette smoking. A combination of smokers and candles
burned for several hours a day to mask the smell will produce quite
heavy discolouration in a few months whilst a similar house with
non-smokers and no candles may not have noticeable marking for
several years.

--
Peter Parry.
http://www.wpp.ltd.uk/