i keep my 2 ps2s on a little shelf in front of my bigscreen. seeing that im on my 6th and 7th ps2 i try to take really good care of them. i dust the shelf about every 4 days with pledge. and i clean my lasers about every 3 months. i think generally it has to do with how clean you keep your room or house. if theres visible dust on your dresser or whatever theres probably dust on your ps2.
back in the day i use to cover my ps2 with this grey cloth that you get with some pc monitors that worked pretty well.
v7 with messiah2 v 1.31
v9 unmodded running mc exploit