We have 40 year old Pan Abode Cedar Log summer cottage. Over the past 20 years nothing has been done to the maintain the logs and the outside has been getting blacker and blacker starting at the foundation and working upwards towards the roof. There is definitely some black mold but I am not sure if all of the black coloring is due to mold. I want to get rid of the mold and remove the black color and then refinish the cedar. Please advise on how best to do this and what cleaning products/equ