Sigh. It seems my annual Mini-Split Money Pit Challenge has begun.

This here Toshiba mini-split wall unit has collected the white foam seen in the photo in the past, but this year it's especially bad. Some quick research leads me to believe it is a common issue of algae growth. Can I just try to wetvac this stuff out, spray with a 50/50 bleach and water mix, and then wetvac the drain lines in case their starting to clog? Or am I being ridiculous and I should call a professional in to clean the three units @ nearly $300 each for a full cleaning?

Thanks in advance for your sage advice. :)