Hi fellows, just curious. May I know if the compressor units that we often see on the air-con ledges outside HDB units, are truly weather-proof? Particularly their vents (as can be seen in this photo): My air-con ledge has significant debris leftover from the developer's & contractor's labour. My handspray (read: bidet) is able to flush away the crap until a corner that I can actually reach with a dustpan; but I'm concerned if the ac compressor units can take some splashing (because the jet of water from the handspray isn't exactly a precision tool)...