We first remove the blowers, bathroom grills and exterior
screens. The opening at the grills and blowers are covered.
The blowers are cleaned using compressed air and if necessary
a high- pressure vacuum.
We then push the skipper ball into the opening at the exterior
of the building until reaching the end by pulling the skipper
ball out: it
should remove most if not all the debris since the skipper
ball system can either be push or pull.