Unbelievable how after everything is clean. It's really fun to see how transform dirty areas (houses facade, exterior tiles, garden furniture) from gray to bright white. For occasional use (1 to 2 times a year) is enough for me that size. Perhaps takes a little longer, but it also makes for more fun ... The power is in any case sufficient for everything I've been cleaned. On the contrary, in some areas you have to watch something that is not going on as the paint.