then better clean pre-filter regularly larh hor ? still same rite ? my prev daikin, pre-filter every 2 weeks clean and fcu looks good(never do chemical wash last 5 years, does not rusty and can't find any dirt also, kinda same with ur photo below) at the end still spoiled
...the sales guy from coolserve ever told me, "no matter how regular u clean ur aircon, recent aircon that selling in the store just like handphone, only can tahan 5-6 years, max 10 years if lucky...regular maintenance and without maintenance, diff 1 or 2 years only before it really dead" 