I don't use any chemical if DIY clean. Only general detergent. It is good enough.

If you want to use chemical, can get it from ACE or aircon parts supply shop. Makseure you read the label about safety.

Pressure spray have 2 type. If you using the pressure motor pump, yes, it would damage the fin. Unless you know how to use.

Another type is hand pump. This wan is safe. I use this spray to clean the fin.

yes  bro.    can cut cost  easily and keep your AC  tip top clean .

time ,      i have these days

i figure  to clean the indoor coil and fan  DIY  will take about  1 hours after some experience  .

3 to 6 months depends on  AC usage .
with WD 40 cleaner .
i figure  if more regulary  the dust on the fins dont  get thick .

one of the best , but  price keep go up. 
very safe . 

3-IN-ONE  WD 40  Professional Air-Conditioner Cleaner is a water based cleaning agent which dissolves grease, dirt, fungi, mold & other build-up from the cooling coils of your air-conditioners. After cleaning, your air-conditioner will cool faster. thus saving electricity.

i think should  be safe to use kleenso.
Do a  test first just to be sure .  spray  some on  the  polys  material and see .

what pana  AC  model is  this .
I have a few pana AC but never see polystyrene drain tray .

check lah ... this drain is white poly ...same like in packing material in box of electronic goods.

today they use some solid plastic  .

What detergent u normally use on cleaning the blades? Jet water removes dust but not grease and i dont have spare brush or patience to scrub it. Am currently usingg clothes detergent powder
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Is bed room, then i think its mold, i used a tooth brush to brush it off, but still some stain there, guess I'll leave witht that, cont soak overnight mayb help a bit, even the turbine housing also a lot of dark spots dried up. Could it be essential oil? I regularly use a diffuser with essential oil

I got this, bur for coil, not sure safe on plastic or not, there was once i diluted 1:1 store on 100 plus bottle, it melt adter few hours

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Anyone knows how to open casing of indoor unit for this york model?
I manage to open the filter cover and air flap but cant take out the casing despite taking off all seen screws, tried unbuckling the top clippers but too tight maybe need open from bottom like pana ac, but i grab from bottom cant pull out or lift the cover off. Washed the indoor ac earlier but i think sprayed water to some open area when cleaning the blower, now dripping water on right side below the power board. Need open casing check n wipe clean.

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