I've noticed we have mold on the underneath side of the west side of teh house. What's the best way to get rid of this and what could be causing this? Our crawlspace is well vented with plastic covering the floor.
That is rare in MN where I live,usually moisture has to cause this such as sprinkler systems,no gutters above this area,what #5 said works also Ben Moores deck and siding wash,any kind of deck and siding wash will work. Make sure you are not getting any bleaching agaent or brightner otherwise your stain will change color.