I've no idea on the service frequency but i do clean my pipes. Because it's rather long, (up to 4ft), i clean it with a simple DIY tool. Have a 8.5ft long string, tie up a small piece of sponge in the middle. When cleaning, insert one end into the pipe with the help from water flow from tap. When it comes out the other end of pipe, just pull both end at alternate timing.
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