Need to give an estimate on cleaning a canvas awning.It is 16 X 50.One side is attached to the house while the other side is attached to approximate 8' high poles.I need to know the proper procedure for cleaning one.IE: what do you wash it with?do you wash it while it is still up or do you take it down first?What pressure should I use? How do you figure the price? Do you wash both sides?It has some mold on it so is bleach recommended.It is more dirty than moldy.Do you use an extention wand? Any help will be greatly appreciated.