I have tried to deal with this problem and for a while it was kind of ok but they always manage to find their way to the forum again. Sounds familiar now I mention it
I use Google and have put the forum link onto 'my favourites'. As such I go straight to the forum, not the website...and no problem with these ads. However, if I go from the forum TO the main website I get them..but I don't have to do that often...Ian