kinda new to powerwashing/ soft washing. im mainly doing hard stone surfaces but have been getting asked to do more. right now a guy wants a white vinyl fence done that has dirt splashed up on the bottom and the green mold etc growing on it . can I just lower the pressure and powerwash it all off? will that come out ok and not damage the shine?? or.... is it best to soft wash it with a pump sprayer and solution and then just use a hose or powerwasher on low pressure to wash it all off ? problem is I have no clue what chemical to use and what mixure. how long to let it sit? if it starts to dry will it stain? etc etc or can I just use a homedepot vinyl housing wash and follow the instructions will that be good enough ill attach some pics how much to charge and how much solution do I need ???? for a 6' high solid only doing one side cause the other sides is neigbhors at 12sections about 8' wide each so 96ft then a 4' high section @ 18 sections about 8ft so so 144 ft but its an open fence and i have to do both sides with pieces running up and down. hopefully the pics load and I can get some ideas of how to do it and how much to charge im in north nj so prices could be alittle higher here.